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A154819 a(n) = floor(zeta(zeta(...zeta(2)...))), where zeta appears n times; zeta is the Riemann Zeta function 1
1, 2, 1, 2, 1, 3, 1, 10, 1, 1835, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n)=1 for odd n; a(12) (see the b-file) is too large to display here.

LINKS

Vladimir Reshetnikov, Table of n, a(n) for n=1..12

EXAMPLE

a(1) = floor(zeta(2)); a(2) = floor(zeta(zeta(2)));

MATHEMATICA

Block[{$MaxExtraPrecision = Infinity}, Table[Floor[Nest[Zeta, 2, n]], {n, 1, 12}]]

CROSSREFS

Sequence in context: A137753 A134780 A247379 * A104145 A230981 A123675

Adjacent sequences:  A154816 A154817 A154818 * A154820 A154821 A154822

KEYWORD

nonn

AUTHOR

Vladimir Reshetnikov, Jan 15 2009

STATUS

approved

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Last modified May 25 01:48 EDT 2019. Contains 323534 sequences. (Running on oeis4.)