2,1

By the Lindemann-Weierstrass theorem, this constant is transcendental. - Charles R Greathouse IV, May 13 2019

Table of n, a(n) for n=2..106.

Index entries for transcendental numbers

sec(A001622) = -21.1774240063661444087...

RealDigits[-Sec[GoldenRatio], 10, 120][[1]] (* Harvey P. Dale, Dec 08 2011 *)

(PARI) -1/cos((sqrt(5)+1)/2) \\ Charles R Greathouse IV, May 13 2019

Cf. A001622, A094214, A104457, A098317, A002390, A139339, A139340, A139341, A139342, A139345, A139346, A139347, A139348.

Sequence in context: A015110 A128596 A176305 * A168347 A120475 A086738

Adjacent sequences: A139346 A139347 A139348 * A139350 A139351 A139352

nonn,cons

Mohammad K. Azarian, Apr 15 2008

Offset corrected by Mohammad K. Azarian, Dec 13 2008

Sign in definition added by R. J. Mathar, Feb 05 2009

approved