id:A072046 - OEIS Search Results

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A072046

Greatest common divisor of product of divisors of n and product of non-divisors < n.

+0
1

1, 1, 1, 1, 1, 4, 1, 2, 3, 4, 1, 144, 1, 4, 45, 32, 1, 72, 1, 320, 63, 4, 1, 82944, 125, 4, 729, 448, 1, 162000, 1, 32768, 99, 4, 1225, 3359232, 1, 4, 117, 2560000, 1, 63504, 1, 704, 91125, 4, 1, 254803968, 343, 125000, 153, 832, 1, 8503056, 3025, 9834496, 171, 4, 1 (list; graph; listen)

	OFFSET	`1,6`
	COMMENT	`a(n) = GCD(A007955(n), A055067(n)).`
	EXAMPLE	`a(12) = GCD(A007955(12), A055067(12)) = GCD(1234612,57891011) = GCD(1728,277200) = 144;` `a(13) = GCD(A007955(13), A055067(13)) = GCD(113,234567891011*12) = GCD(13,479001600) = 1.`
	CROSSREFS	`Sequence in context: A106654 A090204 A156915 this_sequence A123609 A075617 A055182` `Adjacent sequences: A072043 A072044 A072045 this_sequence A072047 A072048 A072049`
	KEYWORD	`nonn,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 29 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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