A262892 Indices of nonbranching nodes in the infinite trunk (A259934) of the tree generated by edge-relation A049820(child) = parent

1, 3, 4, 6, 8, 10, 15, 16, 18, 21, 30, 31, 32, 36, 37, 39, 44, 45, 49, 50, 51, 53, 54, 55, 58, 60, 62, 65, 68, 71, 72, 73, 74, 75, 76, 80, 83, 84, 90, 91, 93, 96, 109, 112, 117, 122, 123, 124, 126, 127, 131, 134, 135, 137, 141, 142, 144, 145, 147, 149, 152, 154, 155, 161, 162, 165, 166, 170, 178, 187, 189, 190, 191, 193, 195, 199, 201, 203, 205, 211, 212, 213, 219, 223, 225

Offset

1,2

Comments

Positions of zeros in A262890. Positions of ones in A262891.

Sequence b(n) = A262508(n)-1 = 9235, 9236, 9237, 9246, 9247, 9329, 9330, 9352, 9355, ..., is a subsequence.

Links

Antti Karttunen, Table of n, a(n) for n = 1..4085

Formula

Other identities. For all n >= 1:

A262897(n) = A259934(a(n)) = A262896(a(n)).

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define A262892 (ZERO-POS 1 0 (COMPOSE -1+ A262891)))

Crossrefs

Cf. A049820, A259934, A262890, A262891, A262896.

Cf. A262897 (nonbranching nodes themselves).

Cf. A262508.

Sequence in context: A064269 A260485 A120150 * A109441 A343883 A277319

Adjacent sequences: A262889 A262890 A262891 * A262893 A262894 A262895

Keyword

nonn

Author

Antti Karttunen, Oct 04 2015

Status

approved