ID NAME QUALITY USERS ACC % DIFFICULTY C I
25942 Ball sum   41 1662
11
11
25 Pouring water   97 4538
19
22
26301 Bits. Exponents and Gcd   4 45
21
26

#gcd

Greatest common divisor

https://en.wikipedia.org/wiki/Greatest_common_divisor http://mathworld.wolfram.com/GreatestCommonDivisor.html http://www.mathportal.org/calculators/numbers-calculators/gcd-lcm-calculator.php