login
A195694
Decimal expansion of arccos(-1/r), where r = (1+sqrt(5))/2 (the golden ratio).
3
2, 2, 3, 7, 0, 3, 5, 7, 5, 9, 2, 8, 7, 4, 1, 1, 8, 7, 4, 3, 3, 5, 3, 2, 6, 5, 8, 7, 6, 1, 7, 5, 4, 4, 1, 6, 2, 7, 6, 6, 0, 7, 4, 8, 3, 8, 4, 1, 3, 5, 0, 0, 7, 5, 3, 3, 1, 8, 9, 4, 6, 1, 3, 8, 9, 5, 7, 8, 8, 7, 1, 9, 2, 5, 2, 2, 1, 6, 3, 7, 8, 1, 0, 2, 1, 9, 2, 4, 2, 4, 3, 8, 4, 0, 6, 3, 9, 6, 6, 9
OFFSET
1,1
COMMENTS
Let c1 and c2 be the constants at A195692 and A195694; then c1+c2 = Pi.
EXAMPLE
arccos(-1/r) = 2.2370357592874118743353265876175441...
MATHEMATICA
(See A195692.)
RealDigits[ArcCos[-1/GoldenRatio], 10, 120][[1]] (* Harvey P. Dale, Jan 15 2012 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 22 2011
STATUS
approved