A066233 Numbers k such that the sum of digits of k^k is a prime.

4, 5, 8, 11, 19, 20, 25, 28, 29, 37, 43, 50, 64, 74, 82, 89, 95, 97, 98, 104, 113, 116, 124, 139, 152, 161, 164, 170, 196, 203, 206, 208, 214, 215, 217, 221, 235, 266, 269, 280, 287, 289, 296, 301, 304, 311, 325, 337, 344, 359, 367, 370, 388, 391, 407, 418, 422

Offset: 1

Author

Jason Earls, Dec 19 2001

Keywords

• base
• nonn

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000040, A000312, A007953, A066588.

Programs

PARI

isok(k) = {isprime(sumdigits(k^k))} \\ Harry J. Smith, Feb 07 2010