id:A130065 - OEIS Search Results

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

+0
7

1, 2, 3, 4, 5, 4, 7, 8, 9, 4, 11, 8, 13, 4, 9, 16, 17, 12, 19, 8, 9, 4, 23, 16, 25, 4, 27, 8, 29, 12, 31, 32, 9, 4, 25, 24, 37, 4, 9, 16, 41, 12, 43, 8, 27, 4, 47, 32, 49, 20, 9, 8, 53, 36, 25, 16, 9, 4, 59, 24, 61, 4, 27, 64, 25, 12, 67, 8, 9, 20, 71, 48, 73, 4, 45, 8, 49, 12, 79, 32, 81 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = nA020639(n)/A006530(n) = A052126(n)A020639(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) = A130064(n)-nA046665(n)A074320(n)/A066048(n) = A000290(n)/A130064(n).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	CROSSREFS	`Sequence in context: A111610 A119816 A068794 this_sequence A079881 A058084 A074882` `Adjacent sequences: A130062 A130063 A130064 this_sequence A130066 A130067 A130068`
	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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