id:A103824 - OEIS Search Results

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Choose a(n) to be the smallest 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, 2, 4, 5, 35, 7, 65, 11, 15, 13, 21, 17, 25, 19, 55, 23, 49, 29, 91, 31, 27, 37, 115, 41, 77, 43, 121, 47, 85, 53, 125, 59, 39, 61, 33, 67, 133, 71, 143, 73, 119, 79, 95, 83, 81, 89, 145, 97, 51, 101, 99, 103, 45, 107, 57, 109, 87, 113, 69, 127, 75, 131, 111, 137 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A075593, A075594, A103825.` `Sequence in context: A016048 A021259 A114875 this_sequence A155080 A010780 A076420` `Adjacent sequences: A103821 A103822 A103823 this_sequence A103825 A103826 A103827`
	KEYWORD	`nonn`
	AUTHOR	`Ray Chandler (rayjchandler(AT)sbcglobal.net) Feb 16 2005`
	EXTENSIONS	`Definition corrected by Zak Seidov, Feb 20 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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