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 A082475 #5 Oct 01 2013 17:57:37
%S A082475 2,16,20,25,29,31,33,35,36,41,45,52,62,64,79,81,83,85,88,91,96,102,
%T A082475 103,110,114,116,117,119,122,136,154,155,164,167,172,173,183,185,188,
%U A082475 190,211,218,219,220,225,229,232,233,234,238,246,249,252,256,262,276,277
%N A082475 Prime index i for consecutive primes p(i),p(i+1),p(i+2),p(i+3) that do not have a solution for the congruences p(i)^x+p(i+1)^x = p(i+2) mod p(i+3) and p(i+1)^x-p(i)^x = p(i+2) mod p(i+3).
%e A082475 For primes 3,5,7,11:
%e A082475 3^x+5^x = 7 mod 11 has no solutions.
%e A082475 5^x-3^x = 7 mod 11 has no solutions.
%o A082475 (PARI) list_A082475(lim)={my(f,p0=2,p1=3,p2=5,p3=7);for(p=1,lim,f=0;for(x=0, p3-1,if((p0^x + p1^x)%p3 == p2 || (p1^x-p0^x)%p3 == p2, f=1;break));if(f==0, print1(p","));p0=p1;p1=p2;p2=p3;p3=prime(p+4))};
%Y A082475 Cf. A082371.
%K A082475 nonn
%O A082475 1,1
%A A082475 _Cino Hilliard_, May 11 2003
%E A082475 Corrected sequence and program _Charles R Greathouse IV_, Oct 09 2009