A000209 - OEIS

A000209

Nearest integer to tan n.

0, 2, -2, 0, 1, -3, 0, 1, -7, 0, 1, -226, -1, 0, 7, -1, 0, 3, -1, 0, 2, -2, 0, 2, -2, 0, 1, -3, 0, 1, -6, 0, 1, -75, -1, 0, 8, -1, 0, 4, -1, 0, 2, -1, 0, 2, -2, 0, 1, -3, 0, 1, -6, 0, 1, -45, -1, 0, 8, -1, 0, 4, -1, 0, 2, -1, 0, 2, -2, 0, 1, -3, 0, 1, -6, 0, 1, -32, -1, 0, 9, -1

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

"At lunch one day, feeling even more ebullient than usual, he [Richard Feynman] challenged the table to a competition. He bet that he could solve any problem within sixty seconds, to within ten percent accuracy, that could be stated within ten seconds. ... Under pressure, his friends found themselves unable to stump him. ... Then Paul Olum spoke up. ... He demanded the tangent of ten to the hundredth. The competition was over. ... Even Feynman could not produce that on short notice." [James Gleick, Genius, Pantheon, NY, 1992, p. 178.] - N. J. A. Sloane, Jun 25 2018

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 0..20000 (first 1000 terms from T. D. Noe)

MAPLE

Digits := 100; f := n->round(evalf(tan(n))); [ seq(f(n), n=0..100) ];

MATHEMATICA

Round[Tan[Range[0, 90]]] (* Harvey P. Dale, Aug 26 2013 *)

CROSSREFS

Sequence in context: A105524 A221459 A166387 * A359901 A170982 A296339

Adjacent sequences: A000206 A000207 A000208 * A000210 A000211 A000212

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved