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A090814 a(n)=3*(3^prime(n)-1)/denominator(B(2*prime(n))) where prime(n)=n-th prime and B(k) denotes the k-th Bernoulli number. 0
11, 1093, 3851, 797161, 64570081, 581130733, 1001523179, 581613367499, 308836698141973, 225141952945498681, 219716845645607147, 164128483697268538813, 13294407179478751643893, 90575914334953364003723 (list; graph; refs; listen; history; internal format)
OFFSET

3,1

COMMENTS

Appears to be an integer for n from 3 up to 250.

PROG

(PARI) a(n)=3*(3^prime(n)-1)/denominator(bernfrac(2*prime(n)))

CROSSREFS

Sequence in context: A046187 A004811 A126197 * A153435 A109217 A109227

Adjacent sequences:  A090811 A090812 A090813 * A090815 A090816 A090817

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 11 2004

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Last modified February 14 15:32 EST 2012. Contains 205635 sequences.