A158621 - OEIS

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A158621

Partial products of A001093.

9, 252, 16380, 2063880, 447861960, 154064514240, 79035095805120, 57695619937737600, 57753315557675337600, 76927416322823549683200, 133007502822161917402252800, 292350491203111894450151654400 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,1`
	COMMENTS	`A158620(n) = PRODUCT[k=2..n](k^3-1). A158622(n) is the numerator of the reduced fraction A158620(n)/A158621(n). A158623(n) is the denominator of the reduced fraction A158620(n)/A158621(n).`
	LINKS	`Table of n, a(n) for n=2..13.`
	FORMULA	`PRODUCT[k=2..n](k^3+1) = PRODUCT[k=2..n]A001093(k).`
	EXAMPLE	`a(2) = 2^3+1 = 9. a(3) = (2^3+1)(3^3+1) = 9 28 = 252. a(4) = (2^3+1)(3^3+1)(4^3+1) = 9 * 28 * 65 = 16380.`
	CROSSREFS	`Cf. A001093, A016921, A068601, A158620, A158622-A158624.` `Sequence in context: A135099 A073427 A194790 * A135484 A178186 A212290` `Adjacent sequences: A158618 A158619 A158620 * A158622 A158623 A158624`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post, Mar 23 2009`
	STATUS	`approved`

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Last modified May 22 16:46 EDT 2013. Contains 225553 sequences.