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 A343109 #12 Apr 06 2021 11:03:48 %S A343109 1,2,3,4,6,7,8,9,11,12,14,16,17,18,19,22,23,24,27,28,31,32,33,34,36, %T A343109 38,41,43,44,46,47,48,49,51,54,56,57,59,62,64,66,67,68,71,72,73,76,79, %U A343109 81,82,83,86,88,89,92,94,96,97,98,99,102,103,107,108,112,113 %N A343109 Numbers having no divisor of the form 8*k + 5. %C A343109 Numbers not divisible by at least one of 5, 13, 21, ... %H A343109 Jianing Song, <a href="/A343109/b343109.txt">Table of n, a(n) for n = 1..10000</a> %e A343109 9 is a term since it has no divisor congruent to 5 modulo 8. %o A343109 (PARI) res(n,a,b) = sumdiv(n, d, (d%a) == b) %o A343109 isA343109(n) = (res(n,8,5) == 0) %Y A343109 Numbers having m divisors of the form 8*k + i: A343107 (m=1, i=1), A343108 (m=0, i=3), this sequence (m=0, i=5), A343110 (m=0, i=7), A343111 (m=2, i=1), A343112 (m=1, i=3), A343113 (m=1, i=5), A141164 (m=1, i=7). %Y A343109 Indices of 0 in A188171. %K A343109 nonn,easy %O A343109 1,2 %A A343109 _Jianing Song_, Apr 05 2021