Questions tagged [number]
This challenge is intended to be solved by using, manipulating, accepting as input, or outputting numeric values.
1,122
questions
1
vote
4answers
217 views
Round the digits last digit, over and over
Challenge:
Given two inputs, x and y, round x to one less significant figure, then repeat until it has y number of unrounded digits left. (the decimal point does not count as a digit)
Input & ...
16
votes
7answers
687 views
Satisfying Rounding
Satisfying Rounding
You know when you're in science class, and asked to round to 2 sig figs, but your answer is 5.2501...? You should round to ...
22
votes
4answers
3k views
Golf a number bigger than Loader's number
As a follow up to Shortest terminating program whose output size exceeds Graham's number and Golf a number bigger than TREE(3), I present a new challenge.
Loader's number is a very large number, ...
13
votes
26answers
1k views
Self-contained powers
Given integer n, output the smallest exponent e greater than 1 such that n^e contains ...
32
votes
47answers
5k views
Print all lexicographically increasing numbers under 10000
A lexicographically increasing number is an integer whose digits are in strictly increasing order. Print all lexicographically increasing numbers under 10000.
Here are lines of the expected output:
...
0
votes
2answers
158 views
Number letter counts [closed]
If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.
Output how many letters would be used if all the numbers from ...
7
votes
3answers
1k views
Largest Number in Brainfuck BigInt for each program length up to 50 instructions
This challenge is for the largest finite number you can get BrainFuck programs of given lengths to contain in memory.
We must use one of the BF versions that uses big integers for the cells rather ...
23
votes
25answers
2k views
Sort by Largest Digit(s)
Challenge:
Given a list of integer, sort descending by their single largest digit(s). The order for numbers with the same largest digit are then sorted by second largest digit, etc.
We ignore ...
15
votes
30answers
2k views
Upward and onward to greater glory!
May this challenge serve as (another) tribute to Stan Lee, who passed away aged 95.
Stan Lee has left us an invaluable legacy and a peculiar catch word: Excelsior. So here's a small challenge based ...
10
votes
9answers
1k views
Through Space and Time
Introduction:
In general we usually speak of four dimensions: three space dimensions for x, y, and ...
16
votes
50answers
2k views
Print the Lost numbers
As a big fan of the Lost TV series, I always got intrigued by the sequence of numbers that repetitively appears on the episodes. These numbers are:
\$ 4, 8, 15, 16, 23, 42\$ (A104101)
Using any ...
-1
votes
5answers
514 views
Fastest algorithm to output array containing all integers in range excluding duplicate digits
Input is a single integer in ascending digit order.
The only valid inputs are:
12
123
1234
...
7
votes
12answers
850 views
Decimal Digit Truncating
Input:
A decimal
Output:
The input truncated
How to truncate them?
The integer part of the input will remain the same. The decimal part of the input will be truncated based on the lowest digit in ...
6
votes
4answers
158 views
Seeking Substantial Subcollections
(thanks to @JonathanFrech for the title)
Challenge
Write a program or function that, given a collection of positive integers \$S\$ and a positive integer \$n\$, finds as many non-overlapping ...
5
votes
1answer
109 views
Minimum 1's to get 1-expression for n [duplicate]
Background
Challenge is inspired by this question.
The 1-expression is a formula that in which you add and multiply the number 1 any number of times. Parenthesis is allowed, but concatenating 1's (e....
-4
votes
20answers
416 views
Array indexes to number and number reversed
Given an input array having minimum length 2 and maximum length 9 having any initial values output an array having length ...
26
votes
37answers
9k views
IP address or not?
Your network scanning tool is annoyingly picky about input, and immediately crashes if you feed it an IPv4 address that contains improper characters or isn't properly formatted.
An IPv4 address is a ...
37
votes
52answers
9k views
List all possible titles for the Anno games
In the Anno video game series there are 6 games with a 7th one announced for early 2019. Their titles always feature a year in a specific pattern:
...
24
votes
27answers
2k views
Minimal Power Root
The minimal power iteration of a number \$n\$ is defined as follows:
$$\text{MPI}(n):=n^{\text{min}(\text{digits}(n))}$$
That is, \$n\$ raised to the lowest digit in \$n\$. For example, \$\text{MPI}(...
33
votes
24answers
6k views
Can the number be split into powers of 2?
Yesterday while playing with my kid I noticed the number in his toy train:
So we have $$4281$$ that can be split into $$4-2-8-1$$ or $$2^2-2^1-2^3-2^0$$
So simple challenge: given a non-negative ...
16
votes
6answers
936 views
The Binary Fences
Input:
An integer n in the range 2 <= n <= 10
A list of positive integers
Output:
Convert the integers to their binary ...
15
votes
9answers
649 views
Stagger, stack, sum
Inspired by this Stack Overflow question.
The challenge
Input
An array of square matrices containing non-negative integers.
Output
A square matrix built from the input matrices as follows.
Let \$...
-3
votes
5answers
77 views
Concatenate 2 numeric type values to a fixed size number [closed]
You have 2 numbers, both stored separate as numeric data type.
First number is always 6 digits long.
Second number can vary between 1 and 4 digits. If it's less than 4 digits, it needs to be padded ...
10
votes
13answers
961 views
Multiply and Divide
Given a value x find the smallest numerical value greater than y that is capable of being multiplied and divided by x while retaining all original digits.
The new numbers do not lose digits.
The new ...
17
votes
18answers
4k views
Longest Repeating Subsequence of a Single Digit
Challenge:
Given a positive integer, output the longest single-digit subsequence that occurs at least twice, AND has boundaries of another digit (or the start/end of the integer).
An example:
Input: <...
33
votes
42answers
5k views
Half, Half Half, and, Half
Consider the following number sequence:
\$ 0, \frac{1}{2}, \frac{1}{4}, \frac{3}{4}, \frac{1}{8}, \frac{3}{8}, \frac{5}{8}, \frac{7}{8}, \frac{1}{16}, \frac{3}{16}, \frac{5}{16}, \frac{7}{16}, \...
18
votes
20answers
5k views
Simplistic Lava Lamp
Introduction:
I think everyone knows what a Lava Lamp is, but in case they do not:
(Image source)
They're basically glass tubes that contain wax in a translucent liquid. The bottom part is heated ...
17
votes
39answers
1k views
Sum \$\text{Square}^2\$
Let \$n=42\$ (Input)
Then divisors are : 1, 2, 3, 6, 7, 14, 21, 42
Squaring each divisor : 1, 4, 9, 36, 49, 196, 441, 1764
Taking sum (adding) : 2500
Since \$50\times 50=2500\$ therefore we return ...
23
votes
38answers
2k views
Expand some number
This challenge is based on this Stackoverflow question.
With a positive number as input, output it as the sum of each digit multiplied by its power-of-10 representation.
Input
A number, as an ...
26
votes
19answers
2k views
Crown hundred crownty crown
I noticed a certain game had a peculiar life counter, which instead of stopping at 999, gained a new digit ā the next number was crown hundred or ...
7
votes
3answers
374 views
Print a Quinella Table
ALERT: IN CASE YOU DOUBT, NO PUN ON "QUINE" IS INTENDED
In regulated horse-racing for gambling, bets called Quinella bets exist and in which a person bet on the first two places of a race. ...
15
votes
54answers
2k views
Are all three integers distinct?
You will be given 3 integers as input. The inputs may or may not be
different from each other.
You have to output 1 if all three inputs
are different from each other,
and 0 if any input is ...
14
votes
2answers
400 views
Impatient divisibility test
Your task is to write a program or function
that determines whether a number is divisible by another.
The catch is that it should give an answer as soon as possible,
even if not all digits of the ...
7
votes
17answers
599 views
Extract and Divide
Challenge
For a given positive integer \$n\$:
Repeat the following until \$n < 10\$ (until \$n\$ contains one digit).
Extract the last digit.
If the extracted digit is even (including 0) multiply ...
0
votes
0answers
137 views
Make n n n n = x [duplicate]
Background
So I've been inspired by this puzzleing SE question to create a similar Code Golf challenge. The basic puzzle format is you must use 4 numbers, such as 5 5 5 5, to equal some other number, ...
13
votes
7answers
753 views
Make the biggest and smallest numbers
Inspired by this post over on Puzzling. Spoilers for that puzzle are below.
Given three positive integers as input, (x, y, z), construct the inclusive range ...
11
votes
16answers
2k views
Prime numbers in large number
Given a large number (in base 10), such as 1234567891011121314151617, find prime "subnumbers" in it.
A prime "subnumber" is a consecutive sequence of digits (taken from the input), which represents a ...
26
votes
24answers
2k views
Compare version numbers
When we publish some software, we assign a version number to it. And users may want to update to the latest version of some software. So, it is the time to find out which version should be newer.
...
22
votes
43answers
3k views
Tower of strings
Given a string of text, output it as a 'tower'.
Each slice of the string (of the form 0:n) is repeated 5*n times, so the first ...
17
votes
22answers
2k views
Sort by what the digit pairs describe
Given a positive integer, we can form a new number that's described by its digits taken pairwise (with a leading 0 added for numbers with odd number of digits).
For eg.:
1234 can be read as one 2, ...
9
votes
6answers
506 views
Codegolf Rainbow : Sorting Colors with Reflection
Introduction:
After I posted two rainbow-related challenges: Codegolf Rainbow : Fun with Integer-Arrays 1 and Codegolf Rainbow : Draw in Black-and-White 2, the following comment was made by @ChrisM in ...
30
votes
18answers
2k views
Custom Number Base Converter
The powers that be want to be able to quickly convert any number they have into their own number base using any format they would like.
Input
Your program must accept 3 parameters.
Number: The ...
12
votes
17answers
2k views
Codegolf Rainbow : Draw in Black-and-White
Introduction:
(Source: Wikipedia)
When we look at a rainbow it will always have the colors from top to bottom:
Red; orange; yellow; green; blue; indigo; violet
If we look at these individual rings, ...
12
votes
11answers
2k views
Codegolf Rainbow : Fun with Integer-Arrays
Introduction:
(Source: Wikipedia)
When we look at a rainbow it will always have the colors from top to bottom:
Red; orange; yellow; green; blue; indigo; violet
If we look at these individual rings, ...
41
votes
27answers
7k views
Count Like a Babylonian
Challenge
Given an ASCII representation of a Babylonian number as input, output the number in Western Arabic numerals.
Babylonian Numeral System
How did the Babylonians count? Interestingly, they ...
20
votes
11answers
2k views
A knight's graph on an N-by-N board
In chess, a knight can only move to the positions marked with X relative to its current position, marked with ā:
A Knight's Graph is a graph that represents all legal moves of the knight chess piece ...
22
votes
18answers
1k views
RTA (Reverse-Then-Add) root of a number
The reverse-then-add (RTA) sequence is a sequence obtained by adding a number to its reverse, and repeating the process on the result. For eg.,
$$ 5 + 5 = 10 \Rightarrow 10 + 01 = 11 \Rightarrow 11 +...
-3
votes
1answer
139 views
number decomposition [duplicate]
It's been a while since I posted here, so here we go another day another challenge.
Challenge :
Given a number(n) split it into it's prime factors.
Input :
A ...
24
votes
8answers
3k views
crossed out 44 is still regular 44 ;(
Introduction
On March 24th, 2015 @isaacg golfed his Pyth answer from 44 to 42 bytes. Since a crossed out 44 (44) looks a lot like a regular 44, @Optimizer made the following comment:
striked out ...
0
votes
1answer
144 views
Symmetric Numbers [duplicate]
write a function to tell if a number is symmetric or not.
for example:
input:
151
output:
True
input:
142
output:
False
and so on:
1111 True,
2390 False,
1226221 True
