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A096950
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Denominators of partial sums of series for 3*Artanh(1/3) = (3/2)*ln(2).
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2
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1, 27, 405, 25515, 2066715, 7577955, 2659862205, 71816279535, 3662630256285, 626309773824735, 2415766270466835, 166687872662211615, 7500954269799522675, 1822731887561284010025, 52859224739277236290725
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OFFSET
| 0,2
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COMMENTS
| Numerators are given in A096949.
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FORMULA
| a(n)=denominator(A(n)) with the rational number A(n):= sum(((1/3)^(2*k))/(2*k+1), k=0..n) in lowest terms.
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EXAMPLE
| n=10: A096949(10)/2415766270466835 = 2511722368895123/2415766270466835 = 1.039720770838... approximates 3*Artanh(1/3)= 1.039720770840...
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CROSSREFS
| Sequence in context: A036222 A022655 A155988 * A125484 A022751 A004326
Adjacent sequences: A096947 A096948 A096949 * A096951 A096952 A096953
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KEYWORD
| nonn,easy,frac
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AUTHOR
| Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Jul 16 2004
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