id:A127669 - OEIS Search Results

Search: id:A127669

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Number of numbers mapped to A127668(n) with the map described there.

+0
2

1, 1, 2, 1, 2, 1, 3, 2, 2, 1, 3, 1, 2, 2, 5, 1, 3, 1, 3, 2, 2, 1, 5, 2, 2, 3, 3, 1, 3, 1, 7, 2, 2, 2, 5, 1, 2, 2, 5, 1, 3, 1, 3, 3, 2, 1, 7, 2, 3, 2, 3, 1, 5, 2, 5, 2, 2, 1, 5, 1, 2, 3, 11, 2, 3, 1, 3, 2, 3, 1, 7, 1, 2, 3, 3, 2, 3, 1, 7, 5, 2, 1, 5, 2, 2, 2, 5, 1, 5, 2, 3, 2, 2, 2, 11, 1, 3, 3, 5 (list; graph; listen)

	OFFSET	`2,3`
	COMMENT	`This is not A008481(n), n>=2, which starts similarly, but differs, beginning with n=24.`
	FORMULA	`a(n)=pa(Length( A127668(n))), n>=2. Length gives the number of digits and pa(k):=A000041(k) (partition numbers).`
	EXAMPLE	`a(4)=2 because two numbers are mapped to 11= A127668(4), namely n=p(1)*p(1)=4 and n=p(11)=31. p(n)=A000041(n) (partition numbers).`
	CROSSREFS	`Cf. a(24)=5 but A008481(24)=4.` `The five numbers mapped to A127668(24)= 2111 are: 18433, 2594, 2263, 292, 24.` `Sequence in context: A098893 A069248 A008481 this_sequence A056692 A039637 A069157` `Adjacent sequences: A127666 A127667 A127668 this_sequence A127670 A127671 A127672`
	KEYWORD	`nonn,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jan 23 2007`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

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