id:A075608 - OEIS Search Results

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

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1, 9, 77, 27, 49, 33, 91, 51, 133, 39, 119, 69, 143, 21, 121, 57, 203, 93, 169, 63, 247, 81, 299, 147, 209, 123, 217, 87, 187, 111, 253, 153, 259, 99, 289, 129, 221, 159, 161, 141, 301, 177, 319, 117, 329, 201, 287, 219, 361, 183, 343, 237, 581, 171, 341, 273, 323 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A075607, A075609, A075610.` `Sequence in context: A056339 A056329 A082677 this_sequence A126631 A046150 A124131` `Adjacent sequences: A075605 A075606 A075607 this_sequence A075609 A075610 A075611`
	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 December 9 14:43 EST 2009. Contains 170430 sequences.

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