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A134609 Numbers such that the cube root of the sum of cubes of their prime factors is a nonprime integer. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 9 02:59 EST 2023. Contains 360153 sequences. (Running on oeis4.)