A172083 1, followed by numerators of first differences of Bernoulli numbers (B(i) - B(i-1)).

1, -3, 2, -1, -1, 1, 1, -1, -1, 1, 5, -5, -691, 691, 7, -7, -3617, 3617, 43867, -43867, -174611, 174611, 854513, -854513, -236364091, 236364091, 8553103, -8553103, -23749461029, 23749461029, 8615841276005, -8615841276005, -7709321041217, 7709321041217, 2577687858367

Offset

0,2

Links

Table of n, a(n) for n=0..34.

Example

Bernoulli numbers: 1, -1/2, 1/6, 0, -1/30, 0, 1/42, 0, -1/30, 0, 5/66, ...
First differences: -3/2, 2/3, -1/6, -1/30, 1/30, 1/42, -1/42, -1/30, ...
Numerators: -3, 2, -1, -1, 1, 1, -1, -1, 1, 5, -5, -691, 691, 7, ...
Denominators: 2, 3, 6, 30, 30, 42, 42, 30, 30, 66, 66, 2730, ...

Crossrefs

Cf. A027641/A027642.

For denominators see A051717.

Sequence in context: A318291 A251482 A357477 * A337199 A344879 A090189

Adjacent sequences: A172080 A172081 A172082 * A172084 A172085 A172086

Keyword

sign

Author

Paul Curtz, Jan 25 2010

Extensions

Edited and more terms from N. J. A. Sloane, Apr 22 2021

Status

approved