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 A347393 #5 Sep 17 2021 16:16:35 %S A347393 7,10,11,14,16,18,25,27,39,45,63,77,81,99,105,135,182,270,819,1365, %T A347393 1392,1638,4250,15631,21275,63767,122944,161257,203203,446369,936100, %U A347393 1128799,1773827,2808300 %N A347393 Positions of 3's in A347381. %H A347393 <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a> %H A347393 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a> %Y A347393 Cf. A347381. %Y A347393 Cf. also A046060, A336702, A347391, A347392, A347394. %K A347393 nonn %O A347393 1,1 %A A347393 _Antti Karttunen_, Aug 31 2021