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 A122853 #15 Nov 26 2022 16:56:24
%S A122853 3,5,7,17,19,109,509,661,709,1231,12889,13043,26723,43963,44789
%N A122853 Numbers k such that (3^k + 5^k)/8 = A074606(k)/8 is a prime.
%C A122853 (3^k + 5^k)/8 = A074606(k)/8 = A081186(k)/4.
%C A122853 Corresponding primes of the form (3^k + 5^k)/2^3 are listed in {A121938(n)} = {A079773(a(n))} = {19, 421, 10039, 95383574161, 2384331073699, ...}.
%C A122853 No other terms less than 100000. - _Robert Price_, Apr 28 2012
%t A122853 Do[f=5^n+3^n;If[PrimeQ[f/2^3],Print[{n,f/2^3}]],{n,1,1231}]
%o A122853 (PARI) select(n->isprime((3^n + 5^n)/8), vector(2000,i,i)) \\ _Charles R Greathouse IV_, Feb 13 2011
%Y A122853 Cf. A074606, A081186, A121824, A121877, A005058, A005059, A121938, A109347, A079773.
%K A122853 nonn,more
%O A122853 1,1
%A A122853 _Alexander Adamchuk_, Sep 14 2006
%E A122853 a(11)-a(15) from _Robert Price_, Apr 28 2012