id:A055396 - OEIS Search Results

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Smallest prime dividing n is a(n)-th prime (a(1)=0).

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0, 1, 2, 1, 3, 1, 4, 1, 2, 1, 5, 1, 6, 1, 2, 1, 7, 1, 8, 1, 2, 1, 9, 1, 3, 1, 2, 1, 10, 1, 11, 1, 2, 1, 3, 1, 12, 1, 2, 1, 13, 1, 14, 1, 2, 1, 15, 1, 4, 1, 2, 1, 16, 1, 3, 1, 2, 1, 17, 1, 18, 1, 2, 1, 3, 1, 19, 1, 2, 1, 20, 1, 21, 1, 2, 1, 4, 1, 22, 1, 2, 1, 23, 1, 3, 1, 2, 1, 24, 1, 4, 1, 2, 1, 3, 1 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A000040(a(n)) = A020639(n); a(n) <= A061395(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 22 2003`
	LINKS	`Index entries for sequences generated by sieves`
	FORMULA	`a(n) = A049084(A020639(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 22 2003`
	EXAMPLE	`a(15)=2 because 15=3*5, 3<5 and 3 is the 2nd prime`
	CROSSREFS	`Cf. sieve of Eratosthenes: A004280, A038179, A055399.` `Sequence in context: A087267 A128267 A028920 this_sequence A057499 A064839 A094741` `Adjacent sequences: A055393 A055394 A055395 this_sequence A055397 A055398 A055399`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), May 15 2000`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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