A118326 - OEIS

A118326

Engel expansion of tanh(1).

2, 2, 22, 50, 70, 29091, 49606, 174594, 260086, 1395138, 8755202, 13452935, 34664211, 89502392, 490611832, 1152519711, 2034899286, 2281723269, 3511022987, 12377674446, 17495576384, 21346545848, 115293211710

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OFFSET

1,1

LINKS

Simon Plouffe, Table of n, a(n) for n = 1..340

Eric Weisstein's World of Mathematics, Engel Expansion

Index entries for sequences related to Engel expansions

MATHEMATICA

EngelExp[A_, n_]:=Join[Array[1&, Floor[A]], First@Transpose@NestList[{Ceiling[1/Expand[ #[[1]]#[[2]]-1]], Expand[ #[[1]]#[[2]]-1]}&, {Ceiling[1/(A-Floor[A])], A-Floor[A]}, n-1]]; EngelExp[N[Tanh[1], 7! ], 50] (* Vladimir Joseph Stephan Orlovsky, Jun 08 2009 *)

CROSSREFS

Sequence in context: A036110 A143807 A118454 * A212847 A087405 A357244

Adjacent sequences: A118323 A118324 A118325 * A118327 A118328 A118329

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Apr 23 2006

STATUS

approved