id:A121061 - OEIS Search Results

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Numbers n such that n-th partition number A000041(n) is a 3-almost prime (A014612).

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9, 10, 16, 18, 20, 22, 25, 29, 31, 34, 37, 42, 45, 48, 50, 56, 57, 60, 63, 69, 71, 72, 73, 83, 85, 91, 101, 102, 114, 119, 139, 144, 148, 151, 155, 156, 172, 175, 183, 185, 190, 192, 195, 202, 208, 217, 238, 242, 244, 245, 247, 256, 257, 266, 272, 275, 291, 293 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`3-almost prime analogue of: A046063 Numbers n such that n-th partition number A000041(n) is prime; A065729 n-th partition number (A000041[n]) is a semiprime. see also: A065728 Partition numbers (A000041) that are semiprimes (A001358).`
	FORMULA	`A000041[a(n)] in A014612.`
	EXAMPLE	`a(1) = 9 because P(9) = 30 = 2 * 3 * 5.` `a(2) = 10 because P(10) = 42 = 2 * 3 * 7.` `a(3) = 16 because P(16) = 231 = 3 * 7 * 11.`
	CROSSREFS	`Cf. A000041, A046063, A065728, A065729.` `Sequence in context: A003135 A105742 A105834 this_sequence A106690 A045568 A088036` `Adjacent sequences: A121058 A121059 A121060 this_sequence A121062 A121063 A121064`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 09 2006`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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