A277715 Row 5 of A277710: Positions of 5's in A264977; positions of 10's in A277330.

9, 21, 45, 93, 189, 381, 657, 765, 873, 1317, 1533, 1749, 2457, 2637, 3069, 3501, 4329, 4917, 5241, 5277, 5745, 6141, 6345, 7005, 8661, 9561, 9837, 10017, 10485, 10557, 11493, 12285, 12693, 14013, 15129, 17325, 17985, 19125, 19677, 20037, 20973, 21117, 21969, 22989, 24573, 25389, 26793, 28029, 30261, 31545, 34653, 35973

Offset

1,1

Comments

Positions in A260443 of terms that are ten times a perfect square (terms in A033583, although not all of them are present in A260443).

It seems that A068156 from 9 onward is a subsequence, which (if true) would also be a sufficient condition for this sequence to be infinite.

Links

Antti Karttunen, Table of n, a(n) for n = 1..444

Formula

A277716(n) = a(n)/3.

Prog

(Scheme) ;; With Antti Karttunen's IntSeq-library.
(define A277715 (MATCHING-POS 1 1 (lambda (n) (= 5 (A264977 n)))))

Crossrefs

Row 5 of A277710.

Cf. A033583, A068156, A260443, A264977, A277330, A277716.

Sequence in context: A225507 A135187 A246318 * A173391 A259243 A241747

Adjacent sequences: A277712 A277713 A277714 * A277716 A277717 A277718

Keyword

nonn

Author

Antti Karttunen, Oct 29 2016

Status

approved