id:A090270 - OEIS Search Results

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Least positive r such that concatenation k, r, k is prime, where k == 1,3,7 or 9 (mod 10) in increasing order.

+0
3

3, 1, 2, 1, 3, 3, 1, 2, 1, 6, 1, 1, 2, 5, 3, 1, 1, 5, 1, 5, 1, 3, 4, 1, 2, 4, 5, 22, 1, 6, 3, 2, 1, 3, 1, 1, 2, 4, 3, 14, 12, 15, 4, 3, 4, 1, 1, 1, 2, 14, 3, 4, 1, 3, 1, 8, 1, 4, 5, 6, 3, 4, 14, 1, 1, 5, 3, 3, 2, 6, 1, 3, 26, 2, 6, 1, 7, 2, 3, 21, 1, 3, 2, 6, 3, 2, 9, 10, 4, 3, 15, 9, 4, 7, 5, 1, 3, 5, 5, 5, 16 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`131,313,727,919,11311,... etc. are primes.`
	CROSSREFS	`Cf. A090271.` `Sequence in context: A056595 A029351 A035115 this_sequence A029329 A124036 A066743` `Adjacent sequences: A090267 A090268 A090269 this_sequence A090271 A090272 A090273`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 28 2003`
	EXTENSIONS	`More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 03 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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