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A138829 Bisection of imperfect numbers A132999. 2
1, 3, 5, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

FORMULA

G.f.: (-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1). - Alexander R. Povolotsky, Apr 06 2008

MATHEMATICA

CoefficientList[Series[(-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1), {x, 0, 50}], x] (* G. C. Greubel, Feb 21 2017 *)

PROG

(PARI) x='x+O('x^50); Vec((-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1)) \\ G. C. Greubel, Feb 21 2017

CROSSREFS

Cf. A000396, A099057, A099058, A132999.

Sequence in context: A155945 A096985 A206909 * A003265 A193714 A184584

Adjacent sequences: A138826 A138827 A138828 * A138830 A138831 A138832

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Apr 06 2008

STATUS

approved

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Last modified January 31 18:34 EST 2023. Contains 359980 sequences. (Running on oeis4.)