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 A331731 #10 Jan 25 2020 20:53:40 %S A331731 1,1,1,3,1,3,1,5,3,3,1,5,1,3,9,7,1,15,1,5,9,3,1,7,3,3,5,5,1,15,1,11,9, %T A331731 3,9,7,1,3,9,7,1,15,1,5,25,3,1,11,3,45,9,5,1,7,27,7,9,3,1,7,1,3,25,13, %U A331731 27,15,1,5,9,45,1,11,1,3,15,5,9,15,1,11,7,3,1,7,27,3,9,7,1,7,27,5,9,3,27,13,1,135,25,7,1,15,1,7,75 %N A331731 Odd part of A331595(n), where A331595(n) = gcd(A122111(n), A241909(n)). %H A331731 Antti Karttunen, <a href="/A331731/b331731.txt">Table of n, a(n) for n = 1..10000</a> %H A331731 Antti Karttunen, <a href="/A331731/a331731.txt">Data supplement: n, a(n) computed for n = 1..65537</a> %H A331731 <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a> %F A331731 a(n) = A000265(A331595(n)). %o A331731 (PARI) A331731(n) = A000265(A331595(n)); %Y A331731 Cf. A122111, A241909, A331595, A331600. %Y A331731 Cf. also A322865, A331732. %K A331731 nonn %O A331731 1,4 %A A331731 _Antti Karttunen_, Jan 25 2020