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

1,1

Comments

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

Links

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

Example

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.

Crossrefs

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

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

Sequence in context: A206130 A110297 A134608 * A260065 A329488 A086061

Adjacent sequences: A134606 A134607 A134608 * A134610 A134611 A134612

Keyword

nonn

Author

Hieronymus Fischer, Nov 11 2007

Extensions

Minor Edits by Hieronymus Fischer, Apr 20 2013

Status

approved