id:A088836 - OEIS Search Results

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a[n]=[A020639(2n+1)+A006530(2n+1)]/2, arithmetical mean of max and min prime factor applied to odd numbers (i.e. when this mean is integer).

+0
2

3, 5, 7, 3, 11, 13, 4, 17, 19, 5, 23, 5, 3, 29, 31, 7, 6, 37, 8, 41, 43, 4, 47, 7, 10, 53, 8, 11, 59, 61, 5, 9, 67, 13, 71, 73, 4, 9, 79, 3, 83, 11, 16, 89, 10, 17, 12, 97, 7, 101, 103, 5, 107, 109, 20, 113, 14, 8, 12, 11, 22, 5, 127, 23, 131, 13, 4, 137, 139, 25, 12, 17, 5, 149, 151 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`If 2n+1 is prime then a[2n+1]=2n+1.`
	CROSSREFS	`Cf. A020639(n), A006530(n).` `Sequence in context: A051417 A090368 A120374 this_sequence A076565 A100029 A099984` `Adjacent sequences: A088833 A088834 A088835 this_sequence A088837 A088838 A088839`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Oct 31 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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