id:A090818 - OEIS Search Results

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Nonprimes n such that 3*(3^n-1)*B(2n) is an integer, where B(k) denotes the k-th Bernoulli number.

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1, 4, 12, 16, 25, 28, 32, 35, 36, 48, 49, 52, 55, 64, 65, 76, 77, 80, 84, 85, 91, 92, 95, 96, 108, 112, 115, 119, 121, 124, 125, 133, 143, 144, 145, 148, 155, 156, 160, 161, 164, 169, 172, 175, 185, 187, 188, 192, 196, 203, 205, 208, 209, 212, 215, 217, 221, 228 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`It appears that a(n) is never == 2 (mod 4)`
	PROGRAM	`(PARI) a(n)=denominator(bernfrac(2*prime(n)))`
	CROSSREFS	`Sequence in context: A053006 A057962 A073687 this_sequence A075191 A028594 A152680` `Adjacent sequences: A090815 A090816 A090817 this_sequence A090819 A090820 A090821`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 11 2004`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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