id:A068794 - OEIS Search Results

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In prime factorization of n replace all primes by the least prime factor of n; a(1)=1.

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

	OFFSET	`1,2`
	COMMENT	`a(n)<=n<=A068795(n);` `a(n) = A068795(n) iff n=1 or n=p^k for some prime p, k>0.` `a(30)=a(235)=222=8.`
	FORMULA	`a(n) = A020639(n)^A001222(n).`
	CROSSREFS	`Sequence in context: A083245 A111610 A119816 this_sequence A130065 A079881 A058084` `Adjacent sequences: A068791 A068792 A068793 this_sequence A068795 A068796 A068797`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 05 2002`

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

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