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 A080357 #6 Oct 15 2013 22:31:49
%S A080357 2,3,36,54,90,96,99,135,174,330,411,414,516,531,546,651,714,726,741,
%T A080357 744,804,936,939,966,975,999,1014,1071,1134,1170,1191,1365,1395,1401,
%U A080357 1650,1665,1686,1695,1764,1770,1779,1836,1926,2010,2025,2064,2079,2136,2211
%N A080357 Smallest x such that between x and 2x exactly n twin prime numbers can be found.
%F A080357 a(n)=Min[x; A080356(x)=n]
%e A080357 n=7: first seven twin primes counted between 99 and 198: {101,107,137,149,179,191,197}.
%t A080357 f[x_] := Count[Table[PrimeQ[j]&&PrimeQ[j+2], {j, x, 2*x}], True] t=Table[0, {100}]; Do[s=f[n]; If[s<101&&t[[s]]==0, t[[s]]=n], {n, 1, 10000}]; t
%Y A080357 Cf. A001359, A080356.
%K A080357 nonn
%O A080357 1,1
%A A080357 _Labos Elemer_, Feb 19 2003