A054481 - OEIS

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A054481

Highest common factor of successive highly composite numbers (1).

1, 2, 2, 6, 12, 12, 12, 12, 60, 60, 60, 120, 360, 120, 420, 420, 840, 2520, 2520, 2520, 5040, 5040, 5040, 2520, 2520, 5040, 5040, 27720, 27720, 55440, 55440, 55440, 55440, 166320, 55440, 110880, 55440, 360360, 360360 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	FORMULA	`a(n) =GCD(A002182(n-1), A002182(n)) =A002182(n)/A054483(n) =A002182(n-1)/A054482(n)`
	EXAMPLE	`a(7)=12 because A002182(7)=36, A002182(6)=24 and GCD(36,24)=12`
	CROSSREFS	`Cf. A002182, A054482, A054483.` `Sequence in context: A079005 A178802 A156992 * A157285 A173392 A035615` `Adjacent sequences: A054478 A054479 A054480 * A054482 A054483 A054484`
	KEYWORD	`easy,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Mar 31 2000`

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Last modified February 15 07:42 EST 2012. Contains 205717 sequences.