login
A226655
Decimal expansion of the 2nd Lebesgue constant L2.
5
1, 6, 4, 2, 1, 8, 8, 4, 3, 5, 2, 2, 2, 1, 2, 1, 1, 3, 6, 8, 7, 3, 6, 2, 7, 9, 8, 8, 9, 2, 2, 9, 4, 0, 3, 4, 4, 1, 8, 3, 8, 2, 3, 4, 5, 5, 4, 8, 4, 8, 8, 7, 4, 3, 0, 0, 7, 7, 6, 2, 0, 4, 2, 0, 7, 7, 0, 4, 6, 6, 5, 6, 9, 5, 5, 2, 5, 0, 2, 4, 9, 2, 8, 4, 5, 6, 4, 0, 8, 3, 3, 2, 7, 7, 0, 0, 7, 9, 7, 1
OFFSET
1,2
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, page 251.
LINKS
FORMULA
(1/Pi)*integral_{t=0..Pi} abs(sin(5*t/2))/sin(t/2)
Equals 1/5 + sqrt(25 - 2*sqrt(5))/Pi.
EXAMPLE
1.6421884352221211368736279889229403441838234554848874300776204207704665695525...
MATHEMATICA
RealDigits[1/5 + Sqrt[25 - 2*Sqrt[5]]/Pi, 10, 100][[1]]
CROSSREFS
Cf. A226654 (L1), A226656 (L3).
Sequence in context: A193076 A073449 A134300 * A340722 A199741 A125214
KEYWORD
cons,nonn
AUTHOR
STATUS
approved