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A218772 Positions in the infinite trunk of beanstalk (see A179016) where the next node upwards is the smaller of the two possible branches. 4
2, 4, 7, 10, 12, 15, 16, 21, 24, 25, 29, 32, 34, 35, 36, 38, 41, 42, 46, 49, 51, 52, 53, 54, 57, 64, 65, 68, 71, 72, 76, 79, 81, 82, 83, 84, 87, 94, 95, 97, 100, 107, 108, 109, 113, 114, 115, 116, 117, 120, 122, 125, 126, 130, 133, 135, 136, 137, 138, 141, 148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

EXAMPLE

A179016(2) = 3 is the first case where the next term A179016(3) = 4 is the smaller of two branches from 3 (the larger is 5, as 5 = 3+A000120(5)), thus the first term of this sequence is 2.

The next case occurs at A179016(4) = 7, as the next term here is again 8, the smaller of two branches from 7 (the larger being 9, as 9 = 7+A000120(9), thus the second term of this sequence is 4.

PROG

(Scheme with Antti Karttunen's Intseq-library): (define A218772 (NONZERO-POS 1 0 (compose-funs A213728 1+)))

CROSSREFS

Characteristic function: A213728 shifted once left. Complement: A218773. a(n) = A213732(n)-1. First differences: A218774.

Sequence in context: A177093 A164903 A285968 * A057843 A047539 A190521

Adjacent sequences:  A218769 A218770 A218771 * A218773 A218774 A218775

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 05 2012

STATUS

approved

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Last modified January 28 16:38 EST 2022. Contains 350656 sequences. (Running on oeis4.)