id:A070647 - OEIS Search Results

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Largest prime factor of sequence of numbers of the form p*q (p, q distinct primes).

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3, 5, 7, 5, 7, 11, 13, 11, 17, 7, 19, 13, 23, 17, 11, 19, 29, 31, 13, 23, 37, 11, 41, 17, 43, 29, 13, 31, 47, 19, 53, 37, 23, 59, 17, 61, 41, 43, 19, 67, 47, 71, 13, 29, 73, 31, 79, 53, 23, 83, 59, 89, 61, 37, 17, 97, 67, 101, 29, 41, 103, 19, 71, 107, 43, 31, 109, 73, 17 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=P(A006881(n)) where P(x) is the largest prime factor of x.`
	EXAMPLE	`6=23 is the first number of the form pq (p, q distinct primes) hence a(1)=3`
	CROSSREFS	`Sequence in context: A023899 A085965 A141710 this_sequence A070949 A141574 A141261` `Adjacent sequences: A070644 A070645 A070646 this_sequence A070648 A070649 A070650`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 13 2002`

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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