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 A228201 #14 Sep 08 2022 08:46:05
%S A228201 2,3,17,29,31,43,47,53,61,67,71,73,79,83,89,97,127,131,139,163,179,
%T A228201 181,193,197,199,211,223,227,229,233,239,241,251,257,263,271,277,311,
%U A228201 313,317,337,347,367,373,379,383,389,397,401,409,419,433,439,443,449
%N A228201 Smallest of 11 consecutive primes whose sum is not a prime.
%H A228201 Vincenzo Librandi, <a href="/A228201/b228201.txt">Table of n, a(n) for n = 1..1000</a>
%e A228201 31 is in the sequence because 31+37+41+43+47+53+59+61+67+71+73 = 583 and 583 = 11*53.
%t A228201 Transpose[Select[Partition[Prime[Range[150]], 11, 1], ! PrimeQ[Total[#]] &]][[1]]
%t A228201 Prime[Select[Range[100], ! PrimeQ[Sum[Prime[# + i], {i, 0, 10}]] &]] (* _Bruno Berselli_, Aug 22 2013 *)
%o A228201 (Magma) [NthPrime(n): n in [1..120] |not IsPrime(&+[NthPrime(n+s): s in [0..10]])];
%Y A228201 Cf. A180950, A000040.
%K A228201 nonn
%O A228201 1,1
%A A228201 _Vincenzo Librandi_, Aug 20 2013