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 A277713 #10 Oct 30 2016 13:47:15 %S A277713 3,39,75,147,207,291,411,579,819,927,1155,1635,1851,2307,2487,2583, %T A277713 2919,3267,3699,3903,4611,4971,5163,5835,6531,7395,7803,9219,9939, %U A277713 10323,10839,11667,13059,14787,15603,15999,17895,18435,19875,20295,20643,21675,23331,26115,29571,31203,31995,33327,34383,35787,36867,39747,40587,41283,43347 %N A277713 Positions of 3's in A264977; positions of 6's in A277330. %C A277713 Positions in A260443 of terms that are six times a perfect square (terms in A033581, although not all of them are present in A260443). %C A277713 All terms are multiples of three. %H A277713 Antti Karttunen, <a href="/A277713/b277713.txt">Table of n, a(n) for n = 1..555</a> %F A277713 A277714(n) = a(n)/3. %o A277713 (Scheme, with _Antti Karttunen_'s IntSeq-library, two implementations) %o A277713 (define A277713 (MATCHING-POS 1 1 (lambda (n) (= 3 (A264977 n))))) %o A277713 (define A277713 (MATCHING-POS 1 1 (lambda (n) (= 6 (A277330 n))))) %Y A277713 Row 3 of A277710. %Y A277713 Cf. A033581, A260443, A264977, A277701, A277330. %Y A277713 Cf. also A277701, A277712, A277714. %K A277713 nonn %O A277713 1,1 %A A277713 _Antti Karttunen_, Oct 28 2016