Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #6 Feb 22 2017 02:24:19
%S 1,3,5,8,10,12,14,16,18,20,22,24,26,29,31,33,35,37,39,41,43,45,47,49,
%T 51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81,83,85,87,89,91,93,95,
%U 97,99,101,103,105,107,109,111,113,115,117
%N Bisection of imperfect numbers A132999.
%H G. C. Greubel, <a href="/A138829/b138829.txt">Table of n, a(n) for n = 1..1000</a>
%F G.f.: (-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1). - _Alexander R. Povolotsky_, Apr 06 2008
%t 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 *)
%o (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
%Y Cf. A000396, A099057, A099058, A132999.
%K easy,nonn
%O 1,2
%A _Omar E. Pol_, Apr 06 2008