A372914 - OEIS

A372914

Decimal expansion of (3/13)*sqrt(3).

3, 9, 9, 7, 0, 4, 0, 3, 2, 5, 1, 5, 8, 9, 4, 7, 6, 0, 0, 4, 4, 7, 9, 5, 3, 0, 9, 5, 7, 8, 2, 7, 8, 2, 3, 8, 5, 2, 5, 2, 6, 2, 7, 5, 0, 8, 7, 9, 3, 1, 8, 6, 0, 6, 4, 7, 4, 4, 1, 6, 9, 9, 5, 2, 5, 8, 1, 3, 8, 3, 8, 8, 5, 1, 7, 4, 1, 5, 3, 9, 3, 1, 7, 2, 5, 7

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OFFSET

0,1

LINKS

Table of n, a(n) for n=0..85.

FORMULA

Equals Sum_{k>=0} tan(k*Pi/3)/3^k.

EXAMPLE

0.39970403251589476004479530957827823852526275087931860...

MATHEMATICA

s = Sum[Tan[k Pi/3]/3^k, {k, 0, Infinity}]

d = N[s, 100]