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 A354813 #6 Jun 07 2022 13:01:36 %S A354813 21,33,39,51,57,69,87,93,111,123,129,130,141,159,177,183,190,201,213, %T A354813 219,231,237,249,267,291,303,309,310,321,327,339,370,381,393,411,417, %U A354813 430,447,453,471,489,501,519,537,543,573,579,591,597,610,633,669,670,681,687,699,717,723,730,753,771,789,790,807,813 %N A354813 Positions of +3's in A346242. %C A354813 a(11) = 130 is the first term that is not a multiple of 3. %H A354813 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a> %o A354813 (PARI) isA354813(n) = (3==A346242(n)); %Y A354813 Cf. A346242. %K A354813 nonn %O A354813 1,1 %A A354813 _Antti Karttunen_, Jun 07 2022