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 A216305 #11 Sep 07 2012 01:04:23
%S A216305 40,49,70,76,91,157,253,274,301,304,322,349,370,388,475,505,517,622,
%T A216305 652,715,769,817,868,931,994,1015,1039,1063,1078,1132,1168,1228,1240,
%U A216305 1279,1315,1324,1378,1441,1477,1555,1567,1687,1723,1735,1819,1837,1867,1900
%N A216305 Values of k such that 10*k+1 and 10*k+9 alone are prime between 10*k and 10*k+9.
%H A216305 V. Raman, <a href="/A216305/b216305.txt">Table of n, a(n) for n = 1..10000</a>
%F A216305 a(n) >> n log^2 n. - _Charles R Greathouse IV_, Sep 07 2012
%t A216305 t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[ps == {10*n + 1, 10*n + 9}, AppendTo[t, n]], {n, 0, 3319}]; t (* _T. D. Noe_, Sep 04 2012 *)
%Y A216305 Cf. A032352, A007811, A078494.
%K A216305 nonn
%O A216305 1,1
%A A216305 _V. Raman_, Sep 03 2012