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 A273921 #27 Jun 20 2016 11:20:52
%S A273921 0,0,0,0,0,15,253,5561
%N A273921 Number of 11-tuples of primes in arithmetic progression less than 10^n.
%D A273921 See A113827.
%e A273921 The least 11-tuple is {110437, 124297, 138157, 152017, 165877, 179737, 193597, 207457, 221317, 235177, 249037} (this is also the beginning of the least 12-tuple). This is one of the 15 11-tuples corresponding to a(6)=15.
%Y A273921 Cf. A113827 (prime beginning minimal n-tuple of primes in AP).
%Y A273921 Cf. A005115, A093364, A115608, A115609, A115610, A115611, A115612, A115613, A273919, A273920, A273922, A273923.
%K A273921 nonn,hard,more
%O A273921 1,6
%A A273921 _Jean-Marc Rebert_, Jun 04 2016