Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
Return the largest number that is adjacent to a zero
give nth decimal place of pi
Sum the Digits of a Number
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Divisible by 15
Recycled Numbers (CodeJam Qualification Round 2012)
Generalised Hamming Number
Sum of big primes without primes
Add more zeros
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