id:A103825 - OEIS Search Results

Search: id:A103825

Displaying 1-1 of 1 results found.

page 1

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

+0
6

1, 4, 3, 9, 5, 15, 2, 8, 7, 25, 11, 49, 13, 21, 17, 33, 19, 27, 23, 39, 29, 119, 31, 77, 37, 35, 41, 51, 43, 45, 47, 55, 53, 57, 59, 91, 61, 65, 67, 87, 71, 69, 73, 93, 79, 85, 83, 95, 89, 63, 97, 81, 101, 99, 103, 75, 107, 105, 109, 141, 113, 115, 127, 125, 131, 111, 137 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A075593, A075594, A103824.` `Sequence in context: A016704 A131896 A114380 this_sequence A073238 A010655 A123596` `Adjacent sequences: A103822 A103823 A103824 this_sequence A103826 A103827 A103828`
	KEYWORD	`nonn`
	AUTHOR	`Ray Chandler (rayjchandler(AT)sbcglobal.net) Feb 16 2005`
	EXTENSIONS	`Definition corrected by Zak Seidov, Feb 20 2005`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research