id:A122443 - OEIS Search Results

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Least prime factor of powers of semiprimes.

+0
2

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; listen)

	OFFSET	`1,2`
	COMMENT	`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 this_sequence A099318 A091382 A127808` `Adjacent sequences: A122440 A122441 A122442 this_sequence A122444 A122445 A122446`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 06 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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