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 A173055 #2 Mar 31 2012 12:38:28
%S A173055 368,2530,94932,178478,1596520,48989176,129145076,1162268326,
%T A173055 1221074418,1996813914,94143190994,96951758924,762940872982,
%U A173055 19073488804224,36314872537968,68630377389272,232630924325880,617673396313738
%N A173055 Numbers of the form a^b+b^a, a and b are odd primes, b > a.
%C A173055 3^5 + 5^3 = 368, 3^7 + 7^3 = 2530, 5^7 + 7^5 = 94932,..
%t A173055 f[a_,b_]:=Prime[a]^Prime[b]+Prime[b]^Prime[a]; Take[Union[Flatten[Table[f[a,b],{a,2,60},{b,a+1,60}]]],40]
%Y A173055 Cf. A076980, A173054
%K A173055 nonn
%O A173055 1,1
%A A173055 _Vladimir Joseph Stephan Orlovsky_, Feb 08 2010