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A061679 n^3 followed by 7. 2
17, 87, 277, 647, 1257, 2167, 3437, 5127, 7297, 10007, 13317, 17287, 21977, 27447, 33757, 40967, 49137, 58327, 68597, 80007, 92617, 106487, 121677, 138247, 156257, 175767, 196837, 219527, 243897, 270007 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n=1,...,1000

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

FORMULA

a(n) = 10 * n^3 + 7.

G.f.: -x*(-17-19*x-31*x^2+7*x^3) / (x-1)^4 . - R. J. Mathar, Feb 27 2015

EXAMPLE

a(3) = 277 because we can say 10 * 3^3 + 7 = 10 * 27 + 7 = 270 + 7 = 277.

MATHEMATICA

(10 Range[30]^3)+7 (* or *) LinearRecurrence[{4, -6, 4, -1}, {17, 87, 277, 647}, 30] (* Harvey P. Dale, Oct 20 2016 *)

PROG

(PARI) { for (n=1, 1000, write("b061679.txt", n, " ", 10*n^3 + 7) ) } [From Harry J. Smith, Jul 26 2009]

CROSSREFS

Cf. A061722.

Sequence in context: A080770 A118863 A118533 * A271567 A231704 A033654

Adjacent sequences:  A061676 A061677 A061678 * A061680 A061681 A061682

KEYWORD

easy,nonn

AUTHOR

Terrel Trotter, Jr., Jun 23 2001

STATUS

approved

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Last modified May 29 22:45 EDT 2017. Contains 287257 sequences.