A231718 Positions of ones in A231717.

1, 8, 14, 18, 22, 33, 37, 41, 45, 53, 57, 61, 71, 75, 87, 116, 120, 124, 128, 136, 140, 144, 154, 158, 170, 208, 212, 216, 226, 230, 242, 289, 293, 305, 362, 544, 548, 552, 556, 564, 568, 572, 582, 586, 598, 636, 640, 644, 654, 658, 670, 717, 721, 733, 790, 1021

Offset

1,2

Comments

This sequence gives all n at which positions the successive terms A219666(n-1) & A219666(n) in the infinite trunk of the factorial beanstalk differ only in one digit position in their factorial base representations (A007623) and the difference of those digits is exactly one.

Links

Antti Karttunen, Table of n, a(n) for n = 1..11905

Formula

For all n, A230406(a(n)) = A000142(A231719(a(n))).

Example

14 is included, because A219666(13) = 40 = '1220' in factorial base representation, while A219666(14) = 46 = '1320' in factorial base, and they differ only by the third least significant digits, and 3-2 = 1.

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define A231718 (MATCHING-POS 1 1 (lambda (i) (= 1 (A231717 i)))))

Crossrefs

Subset of A230422.

Sequence in context: A072835 A367035 A096229 * A212020 A283597 A112277

Adjacent sequences: A231715 A231716 A231717 * A231719 A231720 A231721

Keyword

nonn

Author

Antti Karttunen, Nov 12 2013

Status

approved