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A084217 Number of k's 1<=k<=n dividing the numerator of 2n-th Bernoulli number. 1
1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 1, 1, 2, 2, 1, 3, 2, 1, 2, 2, 1, 2, 1, 2, 2, 4, 1, 2, 2, 2, 1, 2, 1, 2, 2, 2, 2, 2, 1, 3, 1, 2, 3, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2, 1, 1, 4, 2, 2, 2, 2, 3, 2, 1, 2, 2, 3, 2, 4, 1, 2, 2, 1, 2, 2, 1, 4, 2, 2, 3, 2, 1, 4, 2, 2, 2, 5, 1, 2, 3, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..99.

PROG

(PARI) a(n)=sum(k=1, n, if(numerator(bernfrac(2*n))%k, 0, 1))

CROSSREFS

Sequence in context: A049046 A227945 A003647 * A245548 A025903 A175327

Adjacent sequences:  A084214 A084215 A084216 * A084218 A084219 A084220

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Jun 21 2003

STATUS

approved

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Last modified June 18 10:09 EDT 2021. Contains 345098 sequences. (Running on oeis4.)