id:A111689 - OEIS Search Results

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a(2n-1) = prime(n); a(2n) = least composite number which is coprime to a(2n-1) and which is not already in the sequence.

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2, 9, 3, 4, 5, 6, 7, 8, 11, 10, 13, 12, 17, 14, 19, 15, 23, 16, 29, 18, 31, 20, 37, 21, 41, 22, 43, 24, 47, 25, 53, 26, 59, 27, 61, 28, 67, 30, 71, 32, 73, 33, 79, 34, 83, 35, 89, 36, 97, 38, 101, 39, 103, 40, 107, 42, 109, 44, 113, 45, 127, 46, 131, 48, 137, 49, 139, 50, 149 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`Sequence in context: A071194 A137616 A154581 this_sequence A085093 A021777 A095802` `Adjacent sequences: A111686 A111687 A111688 this_sequence A111690 A111691 A111692`
	KEYWORD	`easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 17 2005`
	EXTENSIONS	`Better description from Lior Manor (lior.manor(AT)gmail.com), Aug 23 2005` `More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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