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The Collatz Conjecture, also known as the 3n+1 conjecture, is a famous open problem named after Lothar Collatz.

4 votes

A Collatz-like problem on prime numbers

On bonus question 3, for $f_k(p)=kp^2+1$, I have found several values for $k$ which have a 2-cycle. I can't show that all $p$ will fall into these cycles or that these are the only cycles. Working b …
Shawn Schafer's user avatar