Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
surface of a spherical planet
give nth decimal place of pi
letter yes yes & letter no no
Multiply 2 numbers
Sums of cubes and squares of sums
Add more zeros
How to reverse spdiags?
Divisors for big integer
Permute diagonal and antidiagonal
Numbers spiral diagonals (Part 2)
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