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 A277712 #7 Oct 30 2016 13:46:54 %S A277712 2,10,26,58,82,122,170,250,346,418,506,562,626,698,842,1018,1130,1258, %T A277712 1402,1690,1858,2042,2266,2522,2810,3386,3722,4090,4538,5050,5330, %U A277712 5626,6242,6626,6778,7450,7810,8186,9082,9682,10106,10418,10514,10666,11258,11986,12490,13258,13562,14906,15626,16378,17074,18170,19186,19370,19810 %N A277712 Positions of 2's in A264977; positions of 3's in A277330. %C A277712 Positions in A260443 of terms that are three times a perfect square (terms in A033428, although not all of them are present in A260443). %F A277712 a(n) = 2*A277701(n). %o A277712 (Scheme, with _Antti Karttunen_'s IntSeq-library, two implementations) %o A277712 (define A277712 (MATCHING-POS 1 1 (lambda (n) (= 2 (A264977 n))))) %o A277712 (define A277712 (MATCHING-POS 1 1 (lambda (n) (= 3 (A277330 n))))) %Y A277712 Row 2 of A277710. %Y A277712 Cf. A033428, A260443, A264977, A277701, A277330. %Y A277712 Cf. also A277713. %K A277712 nonn %O A277712 1,1 %A A277712 _Antti Karttunen_, Oct 28 2016