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Numbers of the form a^b+b^a, a and b are odd primes, b > a.
2

%I #2 Mar 31 2012 12:38:28

%S 368,2530,94932,178478,1596520,48989176,129145076,1162268326,

%T 1221074418,1996813914,94143190994,96951758924,762940872982,

%U 19073488804224,36314872537968,68630377389272,232630924325880,617673396313738

%N Numbers of the form a^b+b^a, a and b are odd primes, b > a.

%C 3^5 + 5^3 = 368, 3^7 + 7^3 = 2530, 5^7 + 7^5 = 94932,..

%t 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 Cf. A076980, A173054

%K nonn

%O 1,1

%A _Vladimir Joseph Stephan Orlovsky_, Feb 08 2010