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

2,1

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

Mathematica

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

Crossrefs

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

Sequence in context: A264643 A016594 A175803 * A146943 A028352 A132699

Adjacent sequences: A019983 A019984 A019985 * A019987 A019988 A019989

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved