A122443 - OEIS

This site is supported by donations to The OEIS Foundation.

A122443

Least prime factor of powers of semiprimes.

1, 2, 2, 3, 2, 2, 3, 2, 3, 2, 5, 2, 3, 2, 5, 2, 2, 3, 2, 7, 3, 5, 3, 2, 2, 2, 5, 3, 2, 7, 3, 2, 5, 2, 3, 7, 3, 2, 5, 2, 2, 3, 5, 2, 7, 11, 2, 3, 3, 7, 2, 3, 2, 11, 5, 2, 5, 2, 3, 7, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`A122444 is greatest prime factor of powers of semiprimes. Cf. A076396 Smallest prime factor of n-th perfect power.`
	FORMULA	`a(n) = A020639(A085155(n)) = least prime factor of A085155 powers of semiprimes.`
	CROSSREFS	`Cf. A000040, A001358, A020639, A076396, A085155.` `Sequence in context: A046027 A046028 A125954 * A099318 A187128 A091382` `Adjacent sequences: A122440 A122441 A122442 * A122444 A122445 A122446`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 06 2006`

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

Last modified February 15 23:34 EST 2012. Contains 205860 sequences.