login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A173907 Primes of form x^y+y^x where x and y are composite numbers. 0

%I #5 May 01 2013 21:06:46

%S 43143988327398957279342419750374600193,

%T 5052785737795758503064406447721934417290878968063369478337,

%U 205688069665150755269371147819668813122841983204711281293004769,3329896365316142756322307042065269797678257903507506764421250291562312417,814539297859635326656252304265822609649892589675472598580095801187688932052096060144958129

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

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

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

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Mar 02 2010

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

%E Definition corrected by _N. J. A. Sloane_, Apr 13 2010

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 09:38 EDT 2024. Contains 371967 sequences. (Running on oeis4.)