id:A068682 - OEIS Search Results

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Numbers n such that the concatenations n, n-2, n and n, n+2, n are primes.

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3, 7, 17, 31, 49, 57, 111, 169, 269, 363, 389, 393, 637, 643, 671, 697, 787, 851, 853, 927, 1033, 1087, 1089, 1151, 1153, 1173, 1217, 1219, 1233, 1261, 1331, 1479, 1671, 1761, 1767, 1837, 1841, 1859, 1921, 2011, 2147, 2149, 2283, 2311, 2353, 2377, 2409 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`17 belongs to this sequence for 171517 as well as 171917 are primes.`
	CROSSREFS	`Cf. A068680, A068681.` `Sequence in context: A079779 A083991 A006628 this_sequence A045425 A099983 A048860` `Adjacent sequences: A068679 A068680 A068681 this_sequence A068683 A068684 A068685`
	KEYWORD	`base,hard,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 02 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 26 2002`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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