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 A326071 #11 Jul 02 2021 01:53:53 %S A326071 1,4,9,12,18,24,25,27,45,49,50,60,63,75,81,84,90,98,99,117,120,121, %T A326071 125,126,132,140,147,150,153,156,168,169,171,175,180,198,204,207,228, %U A326071 234,240,242,243,245,261,264,270,275,276,279,280,289,294,297,306,312,325,333,338,342,343,348,350,351,361,363,369,372 %N A326071 Numbers k such that A325977(k) has a different sign as A325978(k). %C A326071 See comments in A326070. %H A326071 Antti Karttunen, <a href="/A326071/b326071.txt">Table of n, a(n) for n = 1..10000</a> %o A326071 (PARI) isA326071(n) = (sign(A325977(n))!=sign(A325978(n))); \\ For other needed code, see under A325975. %Y A326071 Cf. A325963, A325975, A325977, A325978, A325981. %Y A326071 Cf. A326070 (complement), A326072 (characteristic function). %K A326071 nonn %O A326071 1,2 %A A326071 _Antti Karttunen_, Jun 07 2019