A019986 Decimal expansion of tangent of 88 degrees.

2, 8, 6, 3, 6, 2, 5, 3, 2, 8, 2, 9, 1, 5, 6, 0, 3, 5, 5, 0, 7, 5, 6, 5, 0, 9, 3, 2, 0, 9, 4, 6, 4, 2, 5, 0, 7, 7, 9, 5, 1, 7, 1, 0, 3, 2, 3, 1, 5, 2, 0, 2, 5, 5, 9, 7, 8, 3, 8, 1, 9, 6, 0, 8, 9, 7, 1, 3, 5, 6, 2, 0, 4, 0, 8, 1, 1, 3, 6, 5, 3, 4, 9, 8, 0, 9, 3, 6, 9, 2, 6, 5, 7, 6, 2, 7, 9, 0, 7

Offset: 2

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Comments

Also the decimal expansion of cotangent of 2 degrees. - Ivan Panchenko, Sep 01 2014

The least positive k such that floor(10^k tan 88°) is prime is k = 289 = 17^2. The sum of digits of the resulting prime is the prime 1279, whose sum of digits is the same as that of k, again a prime, 19. - M. F. Hasler, May 19 2023

Links

• Ivan Panchenko, Table of n, a(n) for n = 2..1000

Crossrefs

Cf. A019899 - A019987 (same for 1, ..., 89 degrees).

Programs

Mathematica

RealDigits[Tan[88 Degree],10,120][[1]] (* Harvey P. Dale, Aug 29 2016 *)

Formula

Equals A019897 / A019811. - R. J. Mathar, Feb 12 2025