id:A078896 - OEIS Search Results

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Number of times the smallest prime factor of n is a factor in all numbers <=n; a(1)=1.

+0
3

1, 1, 1, 3, 1, 4, 1, 7, 4, 8, 1, 10, 1, 11, 6, 15, 1, 16, 1, 18, 9, 19, 1, 22, 6, 23, 13, 25, 1, 26, 1, 31, 15, 32, 8, 34, 1, 35, 18, 38, 1, 39, 1, 41, 21, 42, 1, 46, 8, 47, 23, 49, 1, 50, 13, 53, 27, 54, 1, 56, 1, 57, 30, 63, 15, 64, 1, 66, 32, 67, 1, 70, 1, 71, 35, 73, 12, 74, 1, 78, 40 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`For n>1: a(n)=1 iff n is prime;` `a(n)=A078897(n) iff n is a prime power (A000961).`
	CROSSREFS	`Cf. A020639, A078897, A078898.` `Sequence in context: A064575 A094119 A006022 this_sequence A079546 A014413 A131632` `Adjacent sequences: A078893 A078894 A078895 this_sequence A078897 A078898 A078899`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 12 2002`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

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