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 A256385 #34 Sep 08 2022 08:46:11
%S A256385 8,10,11,15,16,20,26,27,28,31,33,36,37,40,41,43,44,45,46,49,53,54,55,
%T A256385 57,58,59,61,64,67,68,71,73,74,75,77,78,80,83,88,89,91,92,93,95,98,
%U A256385 101,103,105,106,107,108,111,112,113,114,116,117,118,120,121,123
%N A256385 Numbers n such that 2n^2+2n+1, 3n^2+6n+5, 6n^2+30n+55 are all composite.
%C A256385 Or numbers n such that n^2 + (n+1)^2 + ... + (n+k)^2 is composite for all k>=0.
%C A256385 For a generalization see comment in A256581.
%t A256385 Select[Range[2, 200], !PrimeQ[2 #^2 + 2 # + 1] && !PrimeQ[3 #^2 + 6 # + 5] && !PrimeQ[6 #^2 + 30 # + 55] &] (* _Vincenzo Librandi_, Apr 01 2015 *)
%t A256385 Select[Range[200],AllTrue[{2#^2+2#+1,3#^2+6#+5,6#^2+30#+55},CompositeQ]&] (* _Harvey P. Dale_, Jul 15 2021 *)
%o A256385 (Magma) [n: n in [0..130] | not IsPrime(2*n^2+2*n+1) and not IsPrime(3*n^2+6*n+5) and not IsPrime(6*n^2+30*n+55)]; // _Vincenzo Librandi_, Apr 01 2015
%Y A256385 Cf. A000290, A001844, A005918, A027865, A089306, A077654, A256546, A256581.
%K A256385 nonn,easy
%O A256385 1,1
%A A256385 _Vladimir Shevelev_, Mar 31 2015
%E A256385 More terms from _Peter J. C. Moses_, Mar 31 2015