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A135781 Positive numbers of the form x^3-3x y^2 (where x,y are positive integers). 2
2, 7, 16, 18, 26, 52, 54, 56, 65, 97, 110, 128, 143, 144, 154, 189, 198, 208, 250, 259, 286, 296, 297, 322, 362, 416, 432, 448, 486, 488, 495, 506, 520, 621, 686, 702, 730, 738, 740, 767, 776, 782, 793, 803, 828, 875, 880, 925, 970, 990, 1024, 1034, 1144 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..53.

MATHEMATICA

a = {}; Do[Do[w = x^3 - 3x y^2; If[(w > 0) && w < 3000, AppendTo[a, w]], {x, 1, 1000}], {y, 1, 1000}]; Union[a]

CROSSREFS

Sequence in context: A262016 A129666 A288675 * A233580 A225323 A167236

Adjacent sequences:  A135778 A135779 A135780 * A135782 A135783 A135784

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 29 2007

STATUS

approved

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Last modified December 6 14:15 EST 2019. Contains 329806 sequences. (Running on oeis4.)