A173055 Numbers of the form a^b+b^a, a and b are odd primes, b > a.

368, 2530, 94932, 178478, 1596520, 48989176, 129145076, 1162268326, 1221074418, 1996813914, 94143190994, 96951758924, 762940872982, 19073488804224, 36314872537968, 68630377389272, 232630924325880, 617673396313738

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..18.

Mathematica

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]

Crossrefs

Cf. A076980, A173054

Sequence in context: A307010 A098823 A252222 * A318938 A240006 A097501

Adjacent sequences: A173052 A173053 A173054 * A173056 A173057 A173058

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Feb 08 2010

Status

approved