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A078977
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Denominator of n-th convergent to e^(2/3).
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1
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1, 1, 19, 134, 153, 287, 3023, 163529, 2619487, 2783016, 5402503, 105430573, 9494154073, 237459282398, 246953436471, 484412718869, 13810509564803, 1740608617884047, 59194503517622401, 60935112135506448
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OFFSET
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1,3
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LINKS
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FORMULA
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Special cases : a(5k+1)=abs(A065923(3k)); a(5k+3)=abs(A065923(3k+2)) where A065923(n)=y(n, -3) where y(n, x)=sum (k=0, n, (n+k)!*(x/2)^k/((n-k)!*k!))
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MATHEMATICA
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Denominator[Convergents[E^(2/3), 20]] (* Harvey P. Dale, Dec 01 2013 *)
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PROG
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(PARI) a(n)=component(component(contfracpnqn(contfrac(exp(2/3), n)), 1), 2) (Warning: this will give only a limited number of correct terms, depending on the precision used. - The Editors, Oct 13 2009. See A078976 for better code.)
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CROSSREFS
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KEYWORD
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frac,nonn
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AUTHOR
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STATUS
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approved
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