# All Questions

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### Crazy but Rational Bases

We have many challenges based on base 10, base 2, base 36, or even base -10, but what about all the other rational bases? Task Given an integer in base 10 and a rational base, return the integer in ...
3k views

### Is this a three-digit number ending in one?

Given a nonnegative integer, return whether it is a three digit number ending in one, in any consistent integer base. In other words, the number needs to be represented in base-N, N being an integer ...
1k views

### Find the Emirps!

An emirp is a non-palindromic prime which, when reversed, is also prime. The list of base 10 emirps can be found on OEIS. The first six are: ...
1k views

### Digital Diversity

A positive integer may be represented in an integer base 1 <= b < inf. When converted to that base it has some number of distinct digits. Any positive ...
820 views

### Decompose a number!

Your task is to decompose a number using the format below. This is similar to base conversion, except that instead of listing the digits in the base, you list the <...
1k views

### Is it really a comcoin?

Very interesting background Comcoins are a currency like any other. The residents of Multibaseania (an economically robust system of city-states with very few residents in a galaxy far, far away) use ...
1k views

### Residue Number System

In the vein of large number challenges I thought this one might be interesting. In this challenge, we will be using the Residue Number System (RNS) to perform addition, subtraction, and ...
943 views

### Base Conversion With Strings

Introduction We've have a few base conversion challenges here in the past, but not many designed to tackle arbitrary length numbers (that is to say, numbers that are long enough that they overflow ...
1k views

### Reverse and square

In this challenge you will compute numbers from a curious sequence. Your input is a single decimal nonnegative integer. Reverse the bits in this integer and then square the number to get the required ...
431 views

### Print a table of numbers in decimal and 2**i bases

Computers live by binary. All programmers know binary. But the 2**x bases are often neglected as non-practical, while they have beautiful relations to binary. To ...
999 views

### Last Nonzero Digits of a Factorial in Base

You should write a program or function which given three positive integers n b k as input outputs or returns the last k digits ...
265 views

### Find a numeric coincidence when representing numbers in various bases

Recently, when doing some code-golf challenge, I came up with with two solutions, in 69 and 105 bytes. It's a remarkable coincidence, because: 69 (decimal) = 105 (octal) 69 (hexadecimal) = 105 (...