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 A231878 #14 Jul 23 2023 01:52:59 %S A231878 2,3,4,5,7,11,13,16,17,18,19,23,27,29,31,37,41,43,45,47,53,59,61,63, %T A231878 67,71,73,79,83,89,97,99,101,103,107,109,113,117,127,131,137,139,144, %U A231878 149,151,153,157,163,167,171,173,179,181,191,193,197,199,200,207,211,216,223,227,229,233,239,241,251,256,257,261,263 %N A231878 Numbers k such that bigomega(k)^2 (cf. A001222) divides k. %C A231878 Contains all primes. - _Ivan Neretin_, Apr 05 2016 %H A231878 Ivan Neretin, <a href="/A231878/b231878.txt">Table of n, a(n) for n = 1..13517</a> (all terms up to 10^5) %t A231878 Select[Range[2, 265], Divisible[#, PrimeOmega[#]^2] &] (* _Ivan Neretin_, Apr 05 2016 *) %o A231878 (PARI) isok(n) = !(n % bigomega(n)^2); \\ _Michel Marcus_, Apr 05 2016 %Y A231878 Cf. A001221, A075592, A185307, A001222, A074946, A134334, A231879 (complement). %K A231878 nonn %O A231878 1,1 %A A231878 _N. J. A. Sloane_, Nov 17 2013