id:A154937 - OEIS Search Results

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Decimal expansion of sum_q 1/(q-1)^2 over the semi-primes q = 4,6,9,10,...

+0
1

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

	OFFSET	`0,1`
	COMMENT	`Semiprime analog of A086242.`
	LINKS	`R. J. Mathar, Series of reciprocal powers of k-almost primes, arXiv:0803.0900 [math.NT], Table 11.`
	FORMULA	`Equals sum_{i=1,2,..,infinity) 1/(A001358(i)-1)^2.`
	EXAMPLE	`Equals 0.2097883239400194927... = 1/3^2+1/5^2+1/8^2+1/9^2+1/13^2+...`
	CROSSREFS	`Sequence in context: A021481 A029686 A083864 this_sequence A037996 A002741 A151887` `Adjacent sequences: A154934 A154935 A154936 this_sequence A154938 A154939 A154940`
	KEYWORD	`cons,nonn`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 17 2009`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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