Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
give nth decimal place of pi
Create logical matrix with a specific row and column sums
Length of the hypotenuse
There are 10 types of people in the world
Draw a 'X'!
Divisors for big integer
Find Missing Number
Pandigital number n°3 (Inspired by Project Euler 32)
Rank of magic square (for beginners)
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