A134609 Numbers such that the cube root of the sum of cubes of their prime factors is a nonprime integer.

256, 588, 693, 3840, 6561, 17787, 178360, 313600, 337365, 350000, 387072, 390625, 407442, 432000, 531674, 535815, 541310, 664909, 697851, 1044582, 1262056, 1264640, 1299272, 1374327, 1547570, 1660360, 1740024, 2160756, 2578968

Offset: 1

Author

Hieronymus Fischer, Nov 11 2007

Keywords

• nonn

Comments

No prime number is a term. Hieronymus Fischer, Apr 20 2013

Examples

			a(2)=588, since 588=2*2*3*7*7 and (2*2^3+3^3+2*7^3)^(1/3)=729^(1/3)=81.
		

Links

• Hieronymus Fischer, Table of n, a(n) for n = 1..250

Crossrefs

Cf. A001597, A025475, A134333, A134344, A134376.

Cf. A134600, A134602, A134605, A134611, A134616, A134618, A134620.

Extensions

Minor Edits by Hieronymus Fischer, Apr 20 2013