id:A001902 - OEIS Search Results

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A001902

Successive denominators of Wallis's approximation to pi/2 (reduced).

+0
8

1, 3, 9, 45, 75, 175, 1225, 11025, 19845, 43659, 160083, 693693, 1288287, 2760615, 41409225, 703956825, 1329696225, 2807136475, 10667118605, 44801898141, 85530896451, 178837328943, 1371086188563, 11425718238025 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`H.-D. Ebbinghaus et al., Numbers, Springer, 1990, p. 146.`
	LINKS	`J. Sondow, A faster product for Pi and a new integral for ln(Pi/2)`
	FORMULA	`... 2.2.4.4.6.6....2n.2n/1.3.3.5.5.7.7....(2n-1).(2n+1) ...`
	CROSSREFS	`Cf. A001901.` `Cf. A001901 for the numerators.` `Sequence in context: A028858 A058106 A021103 this_sequence A068100 A012821 A000246` `Adjacent sequences: A001899 A001900 A001901 this_sequence A001903 A001904 A001905`
	KEYWORD	`nonn,frac`
	AUTHOR	`njas`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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