id:A078897 - OEIS Search Results

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

+0
3

1, 1, 1, 3, 1, 2, 1, 7, 4, 2, 1, 5, 1, 2, 3, 15, 1, 8, 1, 4, 3, 2, 1, 10, 6, 2, 13, 4, 1, 7, 1, 31, 3, 2, 5, 17, 1, 2, 3, 9, 1, 6, 1, 4, 10, 2, 1, 22, 8, 12, 3, 4, 1, 26, 5, 9, 3, 2, 1, 14, 1, 2, 10, 63, 5, 6, 1, 4, 3, 11, 1, 34, 1, 2, 18, 4, 7, 6, 1, 19, 40, 2, 1, 13, 5, 2, 3, 8, 1, 21, 7, 4, 3, 2, 5 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`For n>1: a(n)=1 iff n is prime;` `a(n)=A078896(n) iff n is a prime power (A000961).`
	CROSSREFS	`Cf. A006530, A078896, A078899.` `Sequence in context: A008296 A140185 A106790 this_sequence A011086 A103514 A016570` `Adjacent sequences: A078894 A078895 A078896 this_sequence A078898 A078899 A078900`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 12 2002`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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