This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A277715 #10 Oct 30 2016 13:47:44 %S A277715 9,21,45,93,189,381,657,765,873,1317,1533,1749,2457,2637,3069,3501, %T A277715 4329,4917,5241,5277,5745,6141,6345,7005,8661,9561,9837,10017,10485, %U A277715 10557,11493,12285,12693,14013,15129,17325,17985,19125,19677,20037,20973,21117,21969,22989,24573,25389,26793,28029,30261,31545,34653,35973 %N A277715 Row 5 of A277710: Positions of 5's in A264977; positions of 10's in A277330. %C A277715 Positions in A260443 of terms that are ten times a perfect square (terms in A033583, although not all of them are present in A260443). %C A277715 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. %H A277715 Antti Karttunen, <a href="/A277715/b277715.txt">Table of n, a(n) for n = 1..444</a> %F A277715 A277716(n) = a(n)/3. %o A277715 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A277715 (define A277715 (MATCHING-POS 1 1 (lambda (n) (= 5 (A264977 n))))) %Y A277715 Row 5 of A277710. %Y A277715 Cf. A033583, A068156, A260443, A264977, A277330, A277716. %K A277715 nonn %O A277715 1,1 %A A277715 _Antti Karttunen_, Oct 29 2016