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A005186 a(n) = number of m which take n steps to reach 1 in `3x+1' problem.
(Formerly M0305)
+0
3
1, 1, 1, 1, 1, 2, 2, 4, 4, 6, 6, 8, 10, 14, 18, 24, 29, 36, 44, 58, 72, 91, 113, 143, 179, 227, 287, 366, 460, 578, 732, 926, 1174, 1489, 1879, 2365, 2988, 3780, 4788, 6049, 7628, 9635, 12190, 15409, 19452, 24561, 31025, 39229, 49580, 62680, 79255, 100144 (list; graph; listen)
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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.


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