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 A355455 #4 Jul 02 2022 13:15:42 %S A355455 12,24,36,45,48,60,63,72,84,96,108,120,132,135,144,156,168,175,180, %T A355455 189,192,204,216,225,228,240,252,264,275,276,288,300,312,324,325,336, %U A355455 348,360,372,384,396,405,408,420,425,432,441,444,456,468,475,480,492,495,504,516,528,539,540,552,564,567,575,576,585 %N A355455 Numbers whose fourth smallest divisor is a square. %o A355455 (PARI) %o A355455 A355454(n) = ((numdiv(n)>3) && issquare(divisors(n)[4])); %o A355455 isA355455(n) = A355454(n); %Y A355455 Cf. A000005, A010054, A355454 (characteristic function). %Y A355455 Cf. also A119315. %K A355455 nonn %O A355455 1,1 %A A355455 _Antti Karttunen_, Jul 02 2022