id:A075607 - OEIS Search Results

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a(1) = 1, a(n) = smallest number not occurring earlier such that the concatenation a(n-1) and a(n) is a prime.

+0
4

1, 3, 7, 9, 11, 17, 21, 13, 19, 31, 37, 27, 29, 39, 23, 33, 43, 49, 51, 47, 59, 53, 81, 61, 63, 67, 79, 93, 41, 57, 83, 69, 71, 77, 89, 99, 73, 121, 97, 87, 103, 91, 127, 123, 113, 111, 109, 133, 117, 101, 107, 119, 129, 169, 151, 141, 131, 143, 137, 147, 139 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Almost certainly a permutation of A045572. - David W. Wilson (davidwwilson(AT)comcast.net), Jan 15 2005`
	CROSSREFS	`Cf. A075608, A075609, A075610.` `Sequence in context: A047529 A125667 A072939 this_sequence A088630 A129747 A004614` `Adjacent sequences: A075604 A075605 A075606 this_sequence A075608 A075609 A075610`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 28 2002`
	EXTENSIONS	`More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org) Jun 23 2003`

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Last modified July 6 17:22 EDT 2008. Contains 140988 sequences.

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