A130859 - OEIS

A130859

1729-gonal numbers.

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

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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