Collatz Problem -- from Wolfram MathWorld
https://mathworld.wolfram.com/CollatzProblem.html
WebA problem posed by L. Collatz in 1937, also called the mapping, problem, Hasse's algorithm, Kakutani's problem, Syracuse algorithm, Syracuse problem, Thwaites conjecture, and Ulam's problem (Lagarias 1985). Thwaites (1996) has offered a £1000 reward for resolving the conjecture . Let be an integer.
DA: 21 PA: 80 MOZ Rank: 1