Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
Find the sum of the elements in the "second" diagonal
2 b | ~ 2 b
Piecewise linear interpolation
Divisible by 9
Sums of cubes and squares of sums
Mysterious digits operation (easy)
Getting the indices from a matrice
Recycled Numbers (CodeJam Qualification Round 2012)
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