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A260677 a(n) = number of decimal digits in the n-th odd Catalan number A038003(n). 1
1, 1, 1, 3, 7, 17, 35, 74, 150, 304, 612, 1228, 2460, 4926, 9857, 19721, 39449, 78905, 157818, 315644, 631296, 1262601, 2525212, 5050435, 10100879, 20201769, 40403550, 80807112, 161614235, 323228483, 646456979, 1292913972, 2585827958, 5171655931, 10343311876 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Jon E. Schoenfield, Table of n, a(n) for n = 0..1000

MATHEMATICA

Table[Floor[Log[CatalanNumber[2^n - 1]]/Log[10]] + 1, {n, 0, 27}]

f[n_] := Floor[(LogGamma[2^(n + 1) - 1] - 2*LogGamma[2^n] - n*Log[2])/Log[10]] + 1; Array[f, 34, 0] (* Robert G. Wilson v, Nov 21 2015 *)

PROG

(MAGMA) [Floor((LogGamma(2^(j+1)-1)-2*LogGamma(2^j)-Log(2^j))/Log(10))+1: j in [0..34]]; // Jon E. Schoenfield, Nov 21 2015

(MAGMA) [Floor(Log(Catalan(2^n-1))/Log(10)) + 1: n in [0..20]]; // Vincenzo Librandi, Nov 22 2015

CROSSREFS

Cf. A000108, A038003.

Sequence in context: A178521 A034482 A114100 * A014395 A326520 A295146

Adjacent sequences:  A260674 A260675 A260676 * A260678 A260679 A260680

KEYWORD

nonn,base

AUTHOR

L. Edson Jeffery, Nov 15 2015

EXTENSIONS

a(28)-a(34) from Jon E. Schoenfield, Nov 21 2015

STATUS

approved

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Last modified August 3 19:49 EDT 2020. Contains 336201 sequences. (Running on oeis4.)