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A061679 Concatenation of n^3 and 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
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) ) } \\ Harry J. Smith, Jul 26 2009
CROSSREFS
Sequence in context: A080770 A118863 A118533 * A271567 A231704 A033654
KEYWORD
base,easy,nonn
AUTHOR
Terrel Trotter, Jr., Jun 23 2001
STATUS
approved

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)