A075659 Sum of prime divisors (A008472) is a power of an integer with exponent greater than 1.

14, 15, 28, 39, 45, 46, 55, 56, 66, 75, 87, 92, 94, 98, 112, 117, 132, 135, 155, 158, 183, 184, 186, 188, 196, 198, 203, 224, 225, 247, 255, 261, 264, 275, 285, 290, 291, 295, 299, 316, 322, 323, 334, 351, 354, 357, 368, 372, 375, 376, 392, 396, 405, 418, 429

Offset: 1

Author

Floor van Lamoen, Sep 23 2002

Keywords

• nonn

Links

• Michel Marcus, Table of n, a(n) for n = 1..5000

Crossrefs

Cf. A008472, A001597.

Programs

PARI

isok(n) = {my(f=factor(n)); ispower(sum(k=1, #f~, f[k,1]));} \\ Michel Marcus, Sep 09 2017

Extensions

More terms from Matthew Conroy, Oct 15 2002

Offset corrected by Michel Marcus, Sep 09 2017