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A130859 1729-gonal numbers. 2
1, 1729, 5184, 10366, 17275, 25911, 36274, 48364, 62181, 77725, 94996, 113994, 134719, 157171, 181350, 207256, 234889, 264249, 295336, 328150, 362691, 398959, 436954, 476676, 518125, 561301, 606204, 652834, 701191, 751275, 803086, 856624, 911889, 968881, 1027600, 1088046, 1150219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..37.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

a(n) = (1727n^2 - 1725n)/2.

MATHEMATICA

PolygonalNumber[1729, Range[40]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 15 2016 *)

PROG

(PARI) a(n) = (1727*n^2 - 1725*n)/2 \\ Michel Marcus, Jul 16 2013

CROSSREFS

Cf. A130876.

Sequence in context: A001235 A018850 A062924 * A245671 A154716 A154728

Adjacent sequences:  A130856 A130857 A130858 * A130860 A130861 A130862

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Oct 06 2007, based on a suggestion from Anton Mravcek in 2004.

STATUS

approved

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Last modified July 23 14:11 EDT 2019. Contains 325254 sequences. (Running on oeis4.)