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 A227435 #8 Jul 12 2013 11:25:17 %S A227435 13,31,13,61,43,187,223,217,87,97,57,163,267,133,273,2473,13,3,91,757, %T A227435 367,421,531,177,343,673,1753,721,847,6331,1081,1141,6583,2191,957, %U A227435 1563,423,3951,81,8497,1477,7723,11311,12691,5817,8751,2251,4761,12627,1521,1281,11283,11577,3201,3991,3 %N A227435 Difference between 10^n and the first prime of gap 6 > 10^n. %C A227435 As N increases, the ratio sum(a(n)/n^2)/N for n = 1 to N tends to 2. %H A227435 Pierre CAMI, <a href="/A227435/b227435.txt">Table of n, a(n) for n = 1..272</a> %e A227435 10^1+13 = 23, 23 and 29 primes of gap 6 so a(1)=13. %Y A227435 Cf. A124001, A227432. %K A227435 nonn %O A227435 1,1 %A A227435 _Pierre CAMI_, Jul 11 2013