# Questions tagged [number]

A competition to solve a particular problem through the usage and manipulation of numbers.

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### Finding Not-Quite-Prime Numbers

Your challenge, should you chose to accept it, is to code-golf a function that returns true or false (or some similar meaningful representation of yes and no) if a number meets the following criteria: ...
5k views

### determine longest group of consecutive numbers

INPUT: 10 random numbers each number is greater than 0 and less than 100 list of numbers is presorted, lowest to highest the list will not contain any duplicate numbers CHALLENGE: Write a function ...
730 views

### The group of sequential positive numbers with the highest sum?

Given the following list of numbers, find the group of sequential positive numbers with the highest sum. Example input: 12 2 35 -1 20 9 76 5 4 -3 4 -5 19 80 32 -1 ...
6k views

### Print the amount of ones in a binary number without using bitwise operators

Description Given a number, print the amount of 1s it has in binary representation. Input A number >= 0 in base 10 that ...
1 vote
1k views

### position of the only 1 in a number in binary format [closed]

Every number of the form 2i (where i is a non-negative integer) has a single 1 in its binary representation. Given such a number, output the 1-based position of the ...
2k views

Read input of up to 8 characters presented as hexadecimal number and print this number as decimal number. In case that input can not be presented as hexadecimal input it has to print 0 Rules: It is ...
3k views

### Enumerate all palindromic numbers (in decimal) between 0 and n

Given a non-negative integer n, enumerate all palindromic numbers (in decimal) between 0 and n (inclusive range). A palindromic number remains the same when its digits are reversed. The first ...
2k views

### Machine Epsilon

Machine epsilon is an important floating point number to know when doing numerical calculations. One way to understand it is when this relation ...
16k views

### Shortest way to reverse a number [closed]

Write a function (or equivalent subprogram) to accept a single integer valued argument and return a (similarly typed) value found by reversing the order of the base-10 digits of the argument. For ... 550 views

### Formatting numbers

Today computers use millions of bytes of memory, and decimal or hexadecimal notations get less and less informative. Most human-readable formatting just display the number with the highest unit ...
604 views

### The Prime Grid Game

I had fun solving this, so I offer this golf challenge. The objective of this golf is to find the largest prime number that can be constructed using the given instructions. You should accept 3x3 ...
2k views

### Amicable number calculator [closed]

Write a program that calculates amicable numbers, starting from [0,0], intil the maximum value for an integer is reached in the language you chose to write it in. Amicable numbers are two different ...
882 views

432 views

### Minimum of last k [closed]

Write a function that takes two arguments: a number k and a list l, and that returns another list ...