id:A161360 - OEIS Search Results

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Decimal expansion of Product_p p#/(p#-1).

+0
1

2, 4, 9, 5, 8, 0, 6, 5, 1, 4, 0, 5, 9, 8, 3, 8, 2, 7, 2, 7, 7, 4, 9, 7, 9, 2, 0, 4, 9, 3, 0, 1, 5, 3, 4, 3, 7, 2, 6, 1, 0, 3, 7, 9, 3, 7, 6, 1, 5, 5, 0, 7, 7, 9, 6, 3, 9, 6, 9, 1, 6, 5, 3, 8, 9, 5, 1, 3, 5, 7, 2, 2, 2, 6, 4, 9, 6, 5, 6, 5, 6, 9, 0, 4, 5, 5, 5, 7, 0, 3, 4, 8, 5, 6, 1, 3, 5, 4, 0, 0, 1, 6, 2, 5, 2 (list; cons; graph; listen)

	OFFSET	`1,1`
	COMMENT	`By p# we mean the primorial number which is the product of the primes less than or equal to p.`
	FORMULA	`This number is equal to Sum_k 1/A025487(k).`
	EXAMPLE	`2/1 * 6/5 * 30/29 * ... = 2.495806514059838272774979204930153...`
	PROGRAM	`(PARI) h(n)=local(p, pl, r); p=2; pl=1; r=1.; while(p<n, pl*=p; r/=(1-1./pl); p=nextprime(p+1)); r`
	CROSSREFS	`Cf. A002110, A034386, A025487, A064648.` `Sequence in context: A019912 A081344 A021405 this_sequence A104654 A011182 A063507` `Adjacent sequences: A161357 A161358 A161359 this_sequence A161361 A161362 A161363`
	KEYWORD	`cons,nonn`
	AUTHOR	`Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 07 2009`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.

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