Rect Perimeter

Digit Len

Calculate the total number of digits in an integer given a specific base.

Fish and Chips

Print "fish", "chips", or "fish and chips" depending on divisibility by 2 and 3.

GCD (Greatest Common Divisor)

Compute the greatest common divisor of two non-negative integers using Euclidean algorithm.

Find Prev Prime

Find the largest prime number smaller than or equal to a given integer.

From To

Generate a formatted number sequence strictly stepping from start number to end number.

Add Prime Sum

Calculate the sum of all prime numbers less than or equal to a given positive integer.