A032509 a(n) = round(tan(Pi*(1-1/n)/2)).

0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10, 11, 11, 12, 13, 13, 14, 15, 15, 16, 17, 17, 18, 18, 19, 20, 20, 21, 22, 22, 23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 31, 31, 32, 32, 33, 34, 34, 35, 36, 36, 37, 38, 38, 39, 39, 40, 41, 41, 42, 43, 43, 44

Offset

1,3

Links

Table of n, a(n) for n=1..69.

Maple

f := n->round(evalf(tan((1-1/n)*Pi/2)));

Prog

(PARI) a(n) = round(tan(Pi*(1-1/n)/2)); \\ Michel Marcus, Jun 22 2020

Crossrefs

Cf. A024811 (with floor).

Sequence in context: A020915 A156301 A195124 * A322042 A004523 A038372

Adjacent sequences: A032506 A032507 A032508 * A032510 A032511 A032512

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

Offset corrected and more terms from Sean A. Irvine, Jun 22 2020

Status

approved