A172282 Squares of Bernoulli number denominators A027642.

1, 4, 36, 1, 900, 1, 1764, 1, 900, 1, 4356, 1, 7452900, 1, 36, 1, 260100, 1, 636804, 1, 108900, 1, 19044, 1, 7452900, 1, 36, 1, 756900, 1, 205119684, 1, 260100, 1, 36, 1, 3683290256100, 1, 36, 1, 183060900, 1, 3261636, 1, 476100, 1, 79524, 1, 2153888100, 1, 4356, 1, 2528100

Offset: 0

Author

Paul Curtz, Jan 30 2010

Keywords

• nonn
• easy

Comments

Compare the sequence for example with A120083.

Links

• Antti Karttunen, Table of n, a(n) for n = 0..4096

Crossrefs

Cf. A120083, A172298.

Programs

Mathematica

Denominator[BernoulliB[Range[0,60]]]^2 (* Harvey P. Dale, Sep 26 2024 *)

PARI

A172282(n) = (denominator(bernfrac(n))^2); \\ Antti Karttunen, Dec 19 2018

Formula

a(n) = A027642(n)^2 .

Extensions

Edited and extended by R. J. Mathar, Feb 02 2010