A396933 Decimal expansion of the sum of the reciprocals of A202689.

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

Offset

1,1

Links

Kelvin Voskuijl, Table of n, a(n) for n = 1..10000

Formula

Equals hypergeom([], [1/2, 2], 1).

Example

2.11486811849536...

Mathematica

RealDigits[HypergeometricPFQ[{}, {1/2, 2}, 1], 10, 120][[1]]

Prog

(PARI) hypergeom([], [1/2, 2], 1)
(PARI) suminf(n=0, 1/((2*n)! * (n+1)! / 2^(2*n)))

Crossrefs

Cf. A202689.

Cf. A001113, A070910, A271574, A396449, A396450, A396451, A396928, A396929, A396930, A396932, A396933.

Sequence in context: A096540 A277081 A111569 * A371926 A213786 A055130

Adjacent sequences: A396930 A396931 A396932 * A396934 A396935 A396936

Keyword

nonn,cons

Author

Kelvin Voskuijl, Jun 17 2026

Status

approved