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 A076513 #29 Jan 30 2025 12:44:45
%S A076513 1,3,5,65,119,213,1209,2469,2669,3939,11219
%N A076513 Numbers k such that 2 + 2^k + 3^k is prime.
%C A076513 119, 213, 1209 and 2469 proved prime by Primo v1.2.1. - _Robert G. Wilson v_ Oct 17 2002
%C A076513 a(12) > 10^5. - _Giovanni Resta_, Mar 19 2014
%t A076513 Do[ If[ PrimeQ[2 + 2^n + 3^n], Print[n]], {n, 1, 4000, 2}]
%t A076513 Select[Range[10000], PrimeQ[2 + 2^# + 3^#] &] (* _Vincenzo Librandi: Oct 05 2012 *)
%o A076513 (PARI) is(n)=ispseudoprime(2+2^n+3^n) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A076513 Cf. A075996.
%K A076513 nonn,more
%O A076513 1,2
%A A076513 _Zak Seidov_, Oct 17 2002
%E A076513 Edited and extended by _Robert G. Wilson v_, Oct 17 2002
%E A076513 a(10) from _Vincenzo Librandi_, Oct 05 2012
%E A076513 a(11) from _Giovanni Resta_, Feb 19 2013