A331442 Length of n-th chain in A331440.

5, 8, 10, 9, 11, 11, 11, 11, 8, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 20, 16, 41, 31, 28, 28, 31, 54, 21, 9, 36, 11, 24, 23, 32, 10, 37, 42, 12, 27, 46, 16, 40, 27, 6, 19, 45, 13, 42, 42, 37, 61, 37, 98, 93, 18, 44, 33, 19, 59, 35, 54, 166, 131

Offset

1,1

Links

Lars Blomberg, Table of n, a(n) for n = 1..3000

Rémy Sigrist, PARI program for A331442

Example

When starting chain 9, A331440(77) is set to the first free number which is 17, and the chain becomes 17, 34, 68, 136, 272, 544, 1088, 2176 with length 8.

Prog

(PARI) See Links section.

Crossrefs

Cf. A331440, A331441.

Sequence in context: A276934 A127493 A380814 * A006186 A230457 A180748

Adjacent sequences: A331439 A331440 A331441 * A331443 A331444 A331445

Keyword

nonn,base

Author

N. J. A. Sloane, Jan 22 2020

Extensions

Corrected a(9) and more terms from Lars Blomberg, Jan 22 2020

Status

approved