A125961 - OEIS

A125961

Decimal expansion of e * sqrt(Pi) * erf(1).

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

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OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

J.-P. Allouche and T. Baruchel, Variations on an error sum function for the convergents of some powers of e, arXiv preprint arXiv:1408.2206 [math.NT], 2014.

FORMULA

Equals Sum_{k >= 1} (2^k / (2k-1)!!).

Equals Integral_{x=0..1} e^x dx/sqrt(1-x). - Amiram Eldar, Jul 04 2020

EXAMPLE

c = 4.06015693855740995107817985133190089786512917863694504946039...

MATHEMATICA