id:A103934 - OEIS Search Results

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Choose a(n) to be the smallest odd number not yet used such that: a(1) = 1, a(2n) = prime, a(2n+1) = composite and partial sums are alternately composite or prime.

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1, 3, 9, 5, 25, 7, 21, 11, 15, 13, 27, 17, 39, 19, 45, 23, 33, 29, 55, 31, 35, 37, 57, 41, 49, 43, 119, 47, 51, 53, 91, 59, 77, 61, 125, 67, 143, 71, 69, 73, 65, 79, 63, 83, 75, 89, 121, 97, 81, 101, 99, 103, 87, 107, 117, 109, 135, 113, 93, 127, 111, 131, 129, 137, 115, 139 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A075593, A075594, A103824, A103825, A103935.` `Sequence in context: A054509 A134001 A088898 this_sequence A077384 A122943 A107051` `Adjacent sequences: A103931 A103932 A103933 this_sequence A103935 A103936 A103937`
	KEYWORD	`nonn`
	AUTHOR	`Ray Chandler (rayjchandler(AT)sbcglobal.net) Feb 21 2005, based on a suggestion from Zak Seidov.`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

AT&T Labs Research