A070821 - OEIS

This site is supported by donations to The OEIS Foundation.

A070821

Integer part of n/(spf(n)*gpf(n)), where spf=A020639 is the smallest prime factor and gpf=A006530 the greatest prime factor.

1, 0, 0, 1, 0, 1, 0, 2, 1, 1, 0, 2, 0, 1, 1, 4, 0, 3, 0, 2, 1, 1, 0, 4, 1, 1, 3, 2, 0, 3, 0, 8, 1, 1, 1, 6, 0, 1, 1, 4, 0, 3, 0, 2, 3, 1, 0, 8, 1, 5, 1, 2, 0, 9, 1, 4, 1, 1, 0, 6, 0, 1, 3, 16, 1, 3, 0, 2, 1, 5, 0, 12, 0, 1, 5, 2, 1, 3, 0, 8, 9, 1, 0, 6, 1, 1, 1, 4, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,8`
	COMMENTS	`m/(spf(m)*gpf(m)) is an integer iff m is not prime;` `a(m) = 0 iff m is prime (A000040);` `for m>1: a(m) = 1 iff m is semiprime (A001358).`
	CROSSREFS	`a(n) = floor(A032742(n)/A006530(n)) = floor(A052126(n)/A020639(n)).` `Sequence in context: A105469 A136167 A140748 * A165890 A051632 A122821` `Adjacent sequences: A070818 A070819 A070820 * A070822 A070823 A070824`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2002`

Content is available under The OEIS End-User License Agreement .

Last modified February 16 04:18 EST 2012. Contains 205860 sequences.