A005699 a(n) = ceiling(tan(n)^2).

0, 3, 5, 1, 2, 12, 1, 1, 47, 1, 1, 51054, 1, 1, 53, 1, 1, 13, 2, 1, 6, 3, 1, 3, 5, 1, 2, 11, 1, 1, 42, 1, 1, 5673, 1, 1, 61, 1, 1, 14, 2, 1, 6, 3, 1, 3, 5, 1, 2, 11, 1, 1, 37, 1, 1, 2042, 1, 1, 70, 1, 1, 15, 2, 1, 6, 3, 1, 3, 5, 1, 2, 10, 1, 1, 33, 1, 1, 1042, 1, 1, 82, 1, 1, 16, 2, 1, 6, 3, 1, 3, 4, 1, 2, 9, 1, 1, 30, 1, 1, 630, 1, 1, 96, 1, 1, 17

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Comments

For n > 0, a(n) = floor(sec(n)^2). - N. J. A. Sloane, Mar 17 2025

Crossrefs

Cf. A005657, A195910.

Programs

PARI

a(n) = ceil(tan(n)^2); \\ Seiichi Manyama, Feb 28 2024

Extensions

More terms from Seiichi Manyama, Feb 28 2024