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 A166104 #6 Jul 19 2017 21:32:12 %S A166104 1,3,5,9,11,15,17,23,25,27,29,33,41,45,47,51,53,55,59,69,71,75,81,83, %T A166104 85,87,89,99,101,107,113,115,121,123,125,131,135,137,141,145,149,153, %U A166104 159,165,167,173,177,179,187,191,197,205,207,213,225,227,233,235,239 %N A166104 Natural numbers whose prime factors are all congruent to 3 or 5 mod 6 (i.e., are in the sequence A045410). %C A166104 1 is included, as it has no prime factors at all, thus no prime factors outside of A045410. %H A166104 A. Karttunen, <a href="/A166104/b166104.txt">Table of n, a(n) for n = 1..1001</a> %o A166104 (MIT Scheme with macro MATCHING-POS by AK:) %o A166104 (define A166104 (MATCHING-POS 1 1 (lambda (n) (for-all? (factor n) (lambda (p) (or (= 1 p) (= 3 p) (= 5 (modulo p 6)))))))) %Y A166104 See the conjecture at A166103. Cf. A045410. %K A166104 nonn %O A166104 1,2 %A A166104 _Antti Karttunen_, Oct 13 2009