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 A354144 #9 May 20 2022 16:35:50 %S A354144 1,2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,19,21,22,23,25,26,27,29,31,32, %T A354144 33,34,35,37,38,39,41,43,46,47,49,51,53,55,57,58,59,61,62,64,65,67,69, %U A354144 71,73,74,77,79,81,82,83,85,86,87,89,91,93,94,95,97,101,103,106,107,109,111,113,115,118,119,121,122,123,125,127,128,129,131,133,134,137 %N A354144 Prime powers together with semiprimes. %C A354144 Union of A000961 and A001358. %C A354144 Although this is 1 together with A102466, it has arisen sufficiently often that it deserves its own entry. %H A354144 N. J. A. Sloane, <a href="/A354144/b354144.txt">Table of n, a(n) for n = 1..10000</a> %p A354144 isPPorSP := proc(n) if n=1 or nops(numtheory[factorset](n)) = 1 or numtheory[bigomega](n) = 2 then 'true' else 'false'; fi; end; %Y A354144 Cf. A000961, A001221, A001222, A001358, A102466. %K A354144 nonn %O A354144 1,2 %A A354144 _N. J. A. Sloane_, May 20 2022