login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A173054 Numbers of the form a^b+b^a, a > 1, b > a. 4
17, 32, 57, 100, 145, 177, 320, 368, 593, 945, 1124, 1649, 2169, 2530, 4240, 5392, 7073, 8361, 16580, 18785, 20412, 23401, 32993, 60049, 65792, 69632, 94932, 131361, 178478, 262468, 268705, 397585, 423393, 524649, 533169, 1048976, 1058576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

2^3+3^2=17,..

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

MATHEMATICA

f[a_, b_]:=a^b+b^a; Take[Union[Flatten[Table[f[a, b], {a, 2, 50}, {b, a+1, 50}]]], 80]

nn=10^50; n=1; Union[Reap[While[n++; k=n+1; num=n^k+k^n; num<nn, Sow[num]; While[k++; num=n^k+k^n; num<nn, Sow[num]]]][[2, 1]]]

CROSSREFS

Cf. A076980

Sequence in context: A038354 A043127 A043907 * A162624 A029817 A162504

Adjacent sequences:  A173051 A173052 A173053 * A173055 A173056 A173057

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Feb 08 2010

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 25 10:37 EST 2020. Contains 332228 sequences. (Running on oeis4.)