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A005657 a(n) = floor( tan(n)^2 ). 6
0, 2, 4, 0, 1, 11, 0, 0, 46, 0, 0, 51053, 0, 0, 52, 0, 0, 12, 1, 0, 5, 2, 0, 2, 4, 0, 1, 10, 0, 0, 41, 0, 0, 5672, 0, 0, 60, 0, 0, 13, 1, 0, 5, 2, 0, 2, 4, 0, 1, 10, 0, 0, 36, 0, 0, 2041, 0, 0, 69, 0, 0, 14, 1, 0, 5, 2, 0, 2, 4, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Robert Israel, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = A005699(n)-1 for n >= 1.

MAPLE

seq(floor(tan(n)^2), n=0..1000); # Robert Israel, Jun 14 2015

MATHEMATICA

Floor[Tan[Range[0, 70]]^2] (* Harvey P. Dale, Nov 06 2011 *)

PROG

(PARI) vector(100, n, n--; floor(tan(n)^2)) \\ Michel Marcus, Jun 15 2015

(MAGMA) [Floor(Tan(n)^2): n in [0..100]]; // Vincenzo Librandi, Jun 15 2015

CROSSREFS

Cf. A005699.

Sequence in context: A226031 A244116 A138133 * A009332 A045872 A154463

Adjacent sequences:  A005654 A005655 A005656 * A005658 A005659 A005660

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 29 23:27 EDT 2015. Contains 261200 sequences.