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A005657 a(n) = floor( tan(n)^2 ). 7
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, 9, 0, 0, 32, 0, 0, 1041, 0, 0, 81, 0, 0, 15, 1, 0, 5, 2, 0, 2, 3, 0, 1, 8, 0, 0, 29, 0, 0, 629 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
R. K. Guy & N. J. A. Sloane, Correspondence, 1985
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
Sequence in context: A138133 A302937 A363367 * A009332 A333184 A045872
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified July 14 20:49 EDT 2024. Contains 374323 sequences. (Running on oeis4.)