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 A216297 #17 Jun 21 2022 04:21:12
%S A216297 9,12,30,36,39,45,48,55,58,72,78,79,87,90,93,96,108,111,144,156,159,
%T A216297 163,165,177,184,198,243,246,261,264,270,276,277,288,289,291,292,303,
%U A216297 313,321,340,345,360,372,384,387,390,396,417,429,432,435,450,498,507
%N A216297 Values of k such that 10k + 7 is the only prime between 10k and 10k + 9.
%H A216297 V. Raman, <a href="/A216297/b216297.txt">Table of n, a(n) for n = 1..10000</a>
%F A216297 a(n) ~ 0.4 n log n. - _Charles R Greathouse IV_, Sep 07 2012
%t A216297 t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[ps == {10*n + 7}, AppendTo[t, n]], {n, 0, 639}]; t (* _T. D. Noe_, Sep 03 2012 *)
%Y A216297 Cf. A032352, A007811, A078494.
%K A216297 nonn
%O A216297 1,1
%A A216297 _V. Raman_, Sep 03 2012