A021256 Decimal expansion of 1/252.

0, 0, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3, 9, 6, 8, 2, 5, 3

Offset

0,3

Comments

Multiplied by -1, this is zeta(-5), where zeta is the Riemann zeta function. - Alonso del Arte, Jan 13 2012

A closely matching sequence: -253968.253968253968 . . . may be derived by the formula stated below which is from Hardy and Wright, An Introduction to the Theory of Numbers, Sixth Ed., p.53 in a proof of the irrationality of e. - Douglas L. Fox, Apr 30 2012

Links

Table of n, a(n) for n=0..86.

Formula

(X^n * (1-X)^n)/n! where X=5, n=7 (see comment above). - Douglas L. Fox, Apr 30 2012

1000000*this = A182480 - 250000. - R. J. Mathar, Feb 21 2023

Example

0.003968253...

Mathematica

RealDigits[1/252, 10, 100][[1]] (* Alonso del Arte, Jan 13 2012 *)

Crossrefs

Sequence in context: A269226 A205557 A193078 * A349850 A331063 A199738

Adjacent sequences: A021253 A021254 A021255 * A021257 A021258 A021259

Keyword

nonn,cons

Author

N. J. A. Sloane.

Status

approved