OFFSET
1,1
FORMULA
EXAMPLE
4.32267504323963714111855606344042809207852173550531955525699965992300301...
MAPLE
evalf(Sum((sin(Pi/n))^2, n=1..infinity), 120);
MATHEMATICA
RealDigits[NSum[Sin[Pi/n]^2, {n, 1, Infinity}, WorkingPrecision -> 120, NSumTerms -> 10000, PrecisionGoal -> 120, Method -> {"NIntegrate", "MaxRecursion" -> 100}]][[1]]
PROG
(PARI) default(realprecision, 120); sumpos(n=1, (sin(Pi/n))^2)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Vaclav Kotesovec, Mar 01 2016
STATUS
approved