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 A175710 #8 Mar 25 2025 16:43:42
%S A175710 10,91,115,119,205,209,213,217,291,295,299,305,323,407,411,485,489,
%T A175710 493,497,501,515,533,685,699,703,717,749,767,785,789,803,917,955,989,
%U A175710 1007,1077,1115,1137,1141,1145,1195,1199,1203,1207,1257,1267,1333,1343,1347
%N A175710 Numbers k such that k-4, k and k+4 are all semiprimes.
%C A175710 If k is a term, one of k-4, k and k+4 is 3 times a prime. - _Robert Israel_, Mar 25 2025
%H A175710 Robert Israel, <a href="/A175710/b175710.txt">Table of n, a(n) for n = 1..10000</a>
%e A175710 a(1)=10 because 10-4=6, 10 and 10+4=14 are all semiprimes.
%p A175710 SP:= select(t -> numtheory:-bigomega(t) = 2, {$1..10000}):
%p A175710 sort(convert(SP intersect (SP +~ 4) intersect (SP -~ 4),list)); # _Robert Israel_, Mar 25 2025
%Y A175710 Cf. A001358, A175612, A175648, A175664.
%K A175710 nonn
%O A175710 1,1
%A A175710 _Juri-Stepan Gerasimov_, Aug 12 2010
%E A175710 Corrected (299, 411 etc inserted) by _R. J. Mathar_, Aug 13 2010
%E A175710 Name edited by _Robert Israel_, Mar 25 2025