Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
Find the palindrome
Knight's Tour Checker
Flip the main diagonal of a matrix
"Look and say" sequence
Set some matrix elements to zero
Find my secret number
Sum of big primes without primes
Recycled Numbers (CodeJam Qualification Round 2012)
Add more zeros
BLOCK x3 (Version 1)
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