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 A286301 #8 May 12 2017 10:25:17
%S A286301 12207031,2141993519227,178250690949465223,2346320474383711003267,
%T A286301 398341412240537151131351,79545183674814239059370551,
%U A286301 494424256962371823779424877,8271964541879648991904246901,32142180034067960734115528951,91264002187709396686868598317
%N A286301 Primes of the form p^10 + p^9 + p^8 + p^7 + p^6 + p^5 + p^4 + p^3 + p^2 + p + 1 when p is prime.
%e A286301 Prime number 12207031 = Sum_{i=0..10} 5^i is the first in the sequence since 23 divides 88573 = Sum_{i=0..10} 3^i as well as 2047 = Sum_{i=0..10} 2^i.
%t A286301 a286301[n_] := Select[Map[(Prime[#]^11-1)/(Prime[#]-1)&, Range[n]], PrimeQ]
%t A286301 a286301[150] (* data *)
%Y A286301 Subsequence of A060885, A162861 and A193574.
%Y A286301 Cf. A162862, A198244, A240693.
%K A286301 nonn
%O A286301 1,1
%A A286301 _Hartmut F. W. Hoft_, May 05 2017