A173907 Primes of form x^y+y^x where x and y are composite numbers.

43143988327398957279342419750374600193, 5052785737795758503064406447721934417290878968063369478337, 205688069665150755269371147819668813122841983204711281293004769, 3329896365316142756322307042065269797678257903507506764421250291562312417, 814539297859635326656252304265822609649892589675472598580095801187688932052096060144958129

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

The terms are 15^32+32^15, 33^38+38^33, 8^69+69^8, 9^76+76^9, 21^68+68^21.

Crossrefs

Cf. A061119, A094133, A162488, A162490, A045344.

Sequence in context: A246289 A095468 A115556 * A095470 A329659 A336775

Adjacent sequences: A173904 A173905 A173906 * A173908 A173909 A173910

Keyword

nonn

Author

Juri-Stepan Gerasimov, Mar 02 2010

Extensions

a(3)-a(5) from Franklin T. Adams-Watters, Mar 22 2010

Definition corrected by N. J. A. Sloane, Apr 13 2010

Status

approved