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 A359151 #6 Dec 17 2022 20:02:31 %S A359151 5,13,17,29,37,41,45,53,61,73,89,97,101,105,109,113,117,125,137,149, %T A359151 153,157,165,173,181,193,197,229,233,241,245,257,261,269,273,277,281, %U A359151 285,293,313,317,325,333,337,345,349,353,357,369,373,385,389,397,401,405,409,421,425,429,433,449,457,461 %N A359151 Numbers of the form 4u+1 with an odd number of prime factors (counted with multiplicity). %o A359151 (PARI) isA359151(n) = A359150(n); %Y A359151 Intersection of A016813 and A026424. %Y A359151 Setwise difference A067019 \ A359153. %Y A359151 Setwise difference A016813 \ A359161. %Y A359151 Cf. A002144, A191218 (subsequences). %Y A359151 Cf. A359150 (characteristic function). %K A359151 nonn %O A359151 1,1 %A A359151 _Antti Karttunen_, Dec 17 2022