id:A129145 - OEIS Search Results

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Alternately odd prime and odd composite numbers.

+0
2

3, 9, 5, 15, 7, 21, 11, 25, 13, 27, 17, 33, 19, 35, 23, 39, 29, 45, 31, 49, 37, 51, 41, 55, 43, 57, 47, 63, 53, 65, 59, 69, 61, 75, 67, 77, 71, 81, 73, 85, 79, 87, 83, 91, 89, 93, 97, 95, 101, 99, 103, 105, 107, 111, 109, 115, 113, 117, 127, 119, 131, 121, 137, 123, 139, 125 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For small n's a(2n) >a(2n-1) (that is for small n's, n-th odd prime less than n-th odd composite number), while for large n's a(2n) <a(2n-1) (nth odd prime larger than n-th odd composite number), cf. A129146`
	FORMULA	`a(2n-1)=A065091(n), a(2n) =A071904(n).`
	CROSSREFS	`Cf. A065091, A071904, A129131, A129146.` `Sequence in context: A084496 A084530 A070355 this_sequence A064471 A054509 A134001` `Adjacent sequences: A129142 A129143 A129144 this_sequence A129146 A129147 A129148`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)gmail.com), Apr 01 2007`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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