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 A130771 #8 Sep 19 2018 16:16:55
%S A130771 26,44,59,61,79,86,103,106,109,125,128,131,146,149,151,161,163,166,
%T A130771 169,179,184,187,194,205,224,236,239,254,257,265,266,268,271,274,278,
%U A130771 281,289,293,296,304,313,316,326,334,341,346,350,355,359,364,367,376,389,391
%N A130771 Numbers n not divisible by 3 for which neither 2n-3 nor 2n+3 are primes.
%C A130771 This is A130699 with the trivial multiples of 3 removed.
%H A130771 Harvey P. Dale, <a href="/A130771/b130771.txt">Table of n, a(n) for n = 1..2500</a>
%e A130771 26 because 2*26+3=55 is not a prime, nor is 2*26-3=49.
%t A130771 Select[Range[400],!Divisible[#,3]&&NoneTrue[2#+{3,-3},PrimeQ]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Sep 19 2018 *)
%o A130771 (PARI) isok(n) = (n % 3) && !isprime(2*n-3) && !isprime(2*n+3) \\ _Michel Marcus_, Jul 11 2013
%Y A130771 Cf. A130699, A001651.
%K A130771 easy,nonn
%O A130771 1,1
%A A130771 _W. Neville Holmes_, Jul 14 2007
%E A130771 Missing term 169 added by _Michel Marcus_, Jul 11 2013