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 A220788 #31 Oct 11 2024 01:38:58
%S A220788 0,1,4,16
%N A220788 Numbers k such that 7^k + 6^k is prime.
%C A220788 Next term is > 15000 if it exists.
%C A220788 Next term is > 100000 if it exists. - _Michael S. Branicky_, Oct 10 2024
%t A220788 Join[{0, 1}, Select[2 Range[500], PrimeQ[7^# + 6^#] &]]
%o A220788 (Magma) /* The program does not work for n>2700: */ [n: n in [0..1000]| IsPrime(7^n + 6^n)];
%o A220788 (PARI) for(n=0, 1000, if(isprime(7^n + 6^n), print1(n, ", ")))
%Y A220788 Cf. A062573, A074619.
%K A220788 nonn,more
%O A220788 1,3
%A A220788 _Vincenzo Librandi_, Jan 10 2013