id:A079303 - OEIS Search Results

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1/(2p^2)*(p-1)!*sum(j=1,p-1,1/j) where p runs through the primes >=5.

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1, 18, 43920, 4397760, 122377651200, 30993058252800, 3921055557027840000, 711860093387348628602880000, 551343268152723132127641600000, 567168796017902020698219516788736000000 (list; graph; listen)

	OFFSET	`3,2`
	COMMENT	`Always an integer.`
	FORMULA	`a(n)=A000254(A000040(n)-1)/2/A000040(n)^2`
	CROSSREFS	`Sequence in context: A060617 A129042 A123401 this_sequence A051591 A013762 A078352` `Adjacent sequences: A079300 A079301 A079302 this_sequence A079304 A079305 A079306`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 09 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research