id:A117543 - OEIS Search Results

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Decimal expansion of the sum of the reciprocals of squared semiprimes.

+0
4

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

	OFFSET	`0,2`
	COMMENT	`Geoffrey Landis and Jonathan Vos Post (personal communication) show that this constant equals ((P2)^2 + P4)/2, where P2 and P4 are constants in A085548 and A085964, respectively.`
	LINKS	`Eric Weisstein's World of Mathematics, Math World: Prime Zeta Function` `Richard J. Mathar, Series of Reciprocal Powers of k-almost Primes [From T. D. Noe (noe(AT)sspectra.com), Oct 09 2008]`
	EXAMPLE	`0.14076043434902338822275...`
	CROSSREFS	`Cf. A001358 (semiprimes).` `A131653 [From T. D. Noe (noe(AT)sspectra.com), Oct 09 2008]` `Sequence in context: A057641 A133930 A077892 this_sequence A070433 A013666 A016682` `Adjacent sequences: A117540 A117541 A117542 this_sequence A117544 A117545 A117546`
	KEYWORD	`cons,nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Mar 28 2006`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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