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A145664
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a(n) = numerator of amazing polynomial of genus 1 and level n for m = 6 = A[1,n](6)
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2
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0, 6, 39, 236, 2835, 42531, 255191, 10718052, 257233353, 2315100317, 2315100338, 152796622518, 1833559470601, 71508819355749, 429052916136639, 2574317496821836, 123567239847463143, 6301929232220740413
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| For numerator of amazing polynomial of genus 1 and level n for m = 1 see A001008.
Definition: Amazing polynomial A[1,2n+1](m) = A[genus 1,level n] is here defined as
Sum[m^(n - d)/d,{d,1,n-1}]
Few first A[1,n](m):
n=1: A[1,1](m)= 0
n=2: A[1,2](m)= m
n=3: A[1,3](m)= m/2 + m^2
n=4: A[1,4](m)= m/4 + m^2/3 + m^3/2 + m^4
General formula which uses amazing polynomials is:
(1/(n+1))Hypergeometric2F1[1,n,n+1,1/m] =
Sum[m^(-x)(1/(x+n),{x,0,Infinity}] =
m^(n)ArcTanh[(2m-1)/(2m^2-2m+1)]-A[1,n](m) =
m^(n)Log[m/(m-1)]-A[1,n](m)
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MAPLE
| A145664 := proc(n) add( 6^(n-d)/d, d=1..n-1) ; numer(%) ; end proc:
seq(A145664(n), n=1..20) ; # R. J. Mathar, Feb 01 2011
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MATHEMATICA
| m = 6; aa = {}; Do[k = 0; Do[k = k + m^(r - d)/d, {d, 1, r - 1}]; AppendTo[aa, Numerator[k]], {r, 1, 30}]; aa
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CROSSREFS
| A145609-A145640, A145656-A145687.
Sequence in context: A007793 A037592 A037683 * A090018 A006256 A052392
Adjacent sequences: A145661 A145662 A145663 * A145665 A145666 A145667
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KEYWORD
| frac,nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Oct 16 2008
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