Hard
Genius Level Riddles
10 XP

The Collatz Conjecture

17,319 solved 58% solve rate 42% fail rate
Take any positive integer. If even, halve it. If odd, multiply by 3 and add 1. Repeat. Does every starting number eventually reach 1?
Only 58% solve this correctly
17,319 attempts
Earn +10 XP for solving
Quick Answer & Explanation
Nobody knows! The Collatz

The answer to this riddle is Nobody knows! The Collatz. Difficulty: Hard · Solved by 17,319 puzzle lovers.

Nobody knows! The Collatz Conjecture has been verified for enormous numbers but remains unproven. Paul Erdos said mathematics is not yet ready for such problems.
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