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 A191147 #10 Nov 27 2016 13:20:29
%S A191147 1,3,7,17,18,31,12,22,59,67,44,38,73,79,88,83,160,71,78,81,129,70,131,
%T A191147 210,297,89,312,189,234,254,394,143,252,220,186,304,329,299,230,360,
%U A191147 295,466,383,193,679,218,340,561,229,427,531,575,512,547,1328,607
%N A191147 The index of the smallest twin-prime pair average that equals the arithmetic mean of 2n-1 different pairs of a lower and an upper twin prime.
%C A191147 A greedy inverse of A190268. (Apparently there are no even terms in A190268.) - _R. J. Mathar_, Jun 03 2011
%F A191147 a(n) = {min k: A190268(k) = 2*n-1}.
%e A191147 a(4)= 17, because the 17th twin prime pair average, A014574(16)=240, can be written in 2*4-1=7 different ways as the mean of a lower and an upper twin prime.
%Y A191147 Cf. A190268.
%K A191147 nonn,less
%O A191147 1,2
%A A191147 _Juri-Stepan Gerasimov_, May 26 2011