id:A130064 - OEIS Search Results

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(n / SmallestPrimeFactor(n)) * GreatestPrimeFactor(n).

+0
7

1, 2, 3, 4, 5, 9, 7, 8, 9, 25, 11, 18, 13, 49, 25, 16, 17, 27, 19, 50, 49, 121, 23, 36, 25, 169, 27, 98, 29, 75, 31, 32, 121, 289, 49, 54, 37, 361, 169, 100, 41, 147, 43, 242, 75, 529, 47, 72, 49, 125, 289, 338, 53, 81, 121, 196, 361, 841, 59, 150, 61, 961, 147, 64, 169, 363 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = nA006530(n)/A020639(n) = A032742(n)A006530(n);` `a(n)>=n; a(n)=n iff n is a prime power: a(A000961(n))=A000961(n);` `a(A001221(n)) <= A001221(n); a(A001222(n)) = A001222(n);` `a(n) = A130065(n)+nA046665(n)A074320(n)/A066048(n) = A000290(n)/A130065(n).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	CROSSREFS	`Sequence in context: A075161 A029636 A079871 this_sequence A068795 A072501 A092975` `Adjacent sequences: A130061 A130062 A130063 this_sequence A130065 A130066 A130067`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2007`

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

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