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 A072179 #10 Feb 17 2017 15:46:14
%S A072179 3,6,9,12,44,883,1277
%N A072179 Numbers n such that n^(n+1) - (n+1)^n is prime.
%C A072179 Some of the larger entries may only correspond to probable primes.
%C A072179 6279 is a term. - _Alexander Adamchuk_, Apr 09 2007
%t A072179 Do[ If[ PrimeQ[ n^(n + 1) - (n + 1)^n], Print[n]], {n, 1, 2000}]
%o A072179 (PARI) is(n)=ispseudoprime(n^(n+1)-(n+1)^n) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A072179 Cf. A072164, A073499.
%K A072179 nonn
%O A072179 1,1
%A A072179 Daniel Gronau (Daniel.Gronau(AT)gmx.de), Jun 30 2002
%E A072179 Edited and extended by _Robert G. Wilson v_, Jul 02 2002