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A122271 Smallest cube prime factor of the numerator of Bernoulli number B(n) (A122270(n)). 4
5, 7, 5, 5, 7, 5, 5, 11, 7, 5, 5, 7, 5, 5, 13, 5, 7, 5, 7, 5, 5, 5, 7, 5, 7, 5, 11, 5, 5, 13, 7, 5, 7, 5, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..35.

Table of factors of the numerators of Bernoulli numbers Bn in the range n=2,...,10000. at www.bernoulli.org

FORMULA

a(n)^3 divides numerator of BernoulliB[ A122270(n) ].

EXAMPLE

a(1) = 5 because 5^3 divides Numerator[ BernoulliB[ A122270[1] ] ].

CROSSREFS

Cf. A122270, A000367, A090997, A090987, A122272, A122273.

Sequence in context: A161376 A107437 A317083 * A011205 A167133 A144567

Adjacent sequences:  A122268 A122269 A122270 * A122272 A122273 A122274

KEYWORD

nonn

AUTHOR

Alexander Adamchuk, Aug 28 2006

STATUS

approved

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Last modified June 18 18:52 EDT 2019. Contains 324215 sequences. (Running on oeis4.)