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 A358761 #11 Nov 30 2022 16:11:28
%S A358761 2,3,5,7,11,13,17,19,23,29,31,32,37,41,43,47,48,53,59,61,67,71,72,73,
%T A358761 79,80,83,89,97,101,103,107,108,109,112,113,120,127,131,137,139,149,
%U A358761 151,157,162,163,167,168,173,176,179,180,181,191,193,197,199,200,208,211,223,227,229,233,239,241,243
%N A358761 Numbers k for which bigomega(k) == 1 (mod 4).
%C A358761 Numbers k such that number of their prime factors (when counted with multiplicity, with A001222) is of the form 4n+1: 1, 5, 9, 13, 17, ..., A016813.
%C A358761 Equally, numbers k for which A349905(k) == 1 (mod 4).
%F A358761 {k | A010873(A001222(k)) = 1}.
%e A358761 48 = 2^4 * 3 has 5 prime factors in total, and 5 is a number of the form 5n+1 (in A016813), therefore 48 is included in this sequence. Or equivalently, because A349905(48) = 621 = 4*155 + 1.
%o A358761 (PARI) isA358761(n) = A358751(n);
%Y A358761 Cf. A000040 (subsequence), A001222, A003415, A003961, A010051, A010873, A016813, A349905, A358751 (characteristic function).
%Y A358761 Setwise difference A026424 \ A358763.
%Y A358761 Cf. also A358760, A358762.
%K A358761 nonn
%O A358761 1,1
%A A358761 _Antti Karttunen_, Nov 29 2022