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A122271 a(n) is the smallest prime whose cube divides the numerator of the Bernoulli number B(A122270(n)). 5
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.

The Bernoulli Number Page, Table of factors of the numerators of Bernoulli numbers Bn in the range n = 2..10000, 2018.

S. S. Wagstaff, Jr, Prime factors of the absolute values of Bernoulli numerators, 2018.

EXAMPLE

a(1) = 5 because 5^3 divides numerator(B(A122270(1)) = numerator(B(250)), but 3^3 does not.

CROSSREFS

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

Sequence in context: A161376 A107437 A317083 * A011205 A167133 A144567

Adjacent sequences:  A122268 A122269 A122270 * A122272 A122273 A122274

KEYWORD

nonn,more

AUTHOR

Alexander Adamchuk, Aug 28 2006

EXTENSIONS

Various sections edited by Petros Hadjicostas, May 12 2020

STATUS

approved

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Last modified September 18 22:25 EDT 2020. Contains 337174 sequences. (Running on oeis4.)