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