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A000319 a(n) = floor(b(n)), where b(n)=tan(b(n-1)), b(0)=1. 4
1, 1, 74, -1, -2, -3, 0, 1, 30, -2, -2, 29, 1, 4, -6, 0, 1, 2, -1, -1, -1, -1, -2, -9, 0, 0, 1, 2, -2, -35, -1, -1, -1, -1, -1, -1, -1, -2, -3, 0, 0, 1, 5, -2, -2, 3, 1, 1, -4, -1, -1, -1, -1, -1, -1, -1, -1, -2, -3, 1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -3, 0, 1, 2, -1, -2, -21, -7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Using 3000-digit precision, interval arithmetic provides an efficient method of computing over 2000000 terms of this sequence. The iteration is stopped when an interval contains an integer. So far, no term equals 319. - T. D. Noe, Mar 07 2008

LINKS

T. D. Noe, Table of n, a(n) for n = 0..10000

EXAMPLE

Tan[Tan[Tan[1]]]=-0.8635... ==> a(3)=-1 Tan[Tan[1]]=74.68.. ==> a(2)=74 - José María Grau Ribas, Apr 13 2010

MATHEMATICA

Floor[Table[Nest[Tan, 1, n], {n, 1, 200}]] - José María Grau Ribas, Apr 13 2010

CROSSREFS

Sequence in context: A291992 A076848 A289853 * A033394 A114969 A104421

Adjacent sequences:  A000316 A000317 A000318 * A000320 A000321 A000322

KEYWORD

sign

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 19 08:51 EST 2017. Contains 294923 sequences.