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 A110067 #8 Mar 04 2015 04:22:48
%S A110067 1,2,4,242
%N A110067 Numbers n such that 10^n + sigma(n) is prime.
%C A110067 All terms are of the form k^2 or 2*k^2. There is no further term up to 16000.
%C A110067 a(5) > 10^6 or it doesn't exist. - _Robert Price_, Mar 03 2015
%t A110067 Do[If[PrimeQ[10^n + DivisorSigma[1, n]], Print[n]], {n, 16000}]
%Y A110067 Cf. A110065, A110066.
%K A110067 more,nonn
%O A110067 1,2
%A A110067 _Farideh Firoozbakht_, Jul 12 2005