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 A087090 #19 May 20 2016 11:26:32
%S A087090 0,5,12,15,17,20,24,35,45,50,59,75,90,92,105,110,119,120,132,134,167,
%T A087090 174,182,222,225,230,264,269,285,320,335,339,362,365,372,390,419,434,
%U A087090 437,455,462,470,479,495,539,540,549,572,594,705,710,714,759,785,789
%N A087090 Positive numbers n such that p=n^2+n+41 and p+2 are twin primes.
%H A087090 Pierre CAMI and Charles R Greathouse IV, <a href="/A087090/b087090.txt">Table of n, a(n) for n = 1..10000</a> (first 2028 terms from Cami)
%e A087090 5 is in the sequence because 71 and 73 are twin primes.
%t A087090 Select[Range[0,800],AllTrue[#^2 +#+{41,43},PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, May 20 2016 *)
%o A087090 (PARI) isok(n) = isprime(n^2+n+41) && isprime(n^2+n+43); \\ _Michel Marcus_, Oct 03 2013
%Y A087090 Cf. A007634, A087091.
%K A087090 nonn
%O A087090 1,2
%A A087090 _Zak Seidov_, Aug 08 2003