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A118227
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Decimal expansion of Cahen's constant.
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1
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6, 4, 3, 4, 1, 0, 5, 4, 6, 2, 8, 8, 3, 3, 8, 0, 2, 6, 1, 8, 2, 2, 5, 4, 3, 0, 7, 7, 5, 7, 5, 6, 4, 7, 6, 3, 2, 8, 6, 5, 8, 7, 8, 6, 0, 2, 6, 8, 2, 3, 9, 5, 0, 5, 9, 8, 7, 0, 3, 0, 9, 2, 0, 3, 0, 7, 4, 9, 2, 7, 7, 6, 4, 6, 1, 8, 3, 2, 6, 1, 0, 8, 4, 8, 4, 4, 0, 8, 9, 5, 5, 5, 0, 4, 6, 3, 4, 3, 1, 9, 5, 4, 0, 5, 3
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Eric Weisstein's World of Mathematics, Cahen's Constant
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EXAMPLE
| 0.6434105462883380261...
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MATHEMATICA
| a[0] = a[1] = a[2] = 2; a[n_] := a[n] = N[a[n-1]^2 - a[n-1] + 1, 120]; Take[RealDigits[Sum[(-1)^k/(a[k]-1), {k, 0, 20}]][[1]], 105] (* From Jean-François Alcover, Jul 28 2011 *)
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CROSSREFS
| Sequence in context: A157296 A155044 A182618 * A199429 A200104 A154747
Adjacent sequences: A118224 A118225 A118226 * A118228 A118229 A118230
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KEYWORD
| nonn,cons
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Apr 16, 2006
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