A318613 Length of iterations of positive integers which do not appear in a Collatz sequence starting from a smaller positive integer.

0, 1, 7, 8, 16, 19, 9, 17, 20, 20, 7, 10, 23, 111, 18, 26, 21, 21, 34, 8, 29, 16, 11, 24, 112, 112, 32, 19, 107, 27, 14, 22, 115, 14, 35, 35, 22, 9, 30, 17, 17, 12, 118, 25, 25, 38, 113, 113, 69, 33, 33, 20, 20, 46, 108, 46, 121, 28, 28, 41, 15, 15

Offset

1,3

Comments

The sequence of the length of the iteration in the Collatz sequence is known as A006577, and the sequence of positive integers which do not appear in a Collatz sequence starting from a smaller positive integer is listed as A177729. This sequence is basically the combination of the two. Taking the sequence A177729 as input and then listing the length of the iteration for those (from A006577).

Links

Table of n, a(n) for n=1..62.

Crossrefs

Cf. A177729, A006577.

Almost the same as A127933.

Sequence in context: A323418 A125195 A099534 * A127933 A006878 A022312

Adjacent sequences: A318610 A318611 A318612 * A318614 A318615 A318616

Keyword

nonn

Author

Peter Stikker, Aug 30 2018

Status

approved