id:A090264 - OEIS Search Results

Search: id:A090264

Displaying 1-1 of 1 results found.

page 1

Numbers n such that the strings n7n and 7n7 are both prime.

+0
4

131, 153, 191, 233, 261, 327, 341, 359, 389, 407, 429, 459, 489, 527, 533, 579, 593, 599, 671, 683, 701, 723, 731, 797, 813, 869, 873, 939, 981, 1083, 1097, 1109, 1143, 1187, 1241, 1283, 1317, 1391, 1437, 1451, 1539, 1553, 1871, 1889, 1893, 2049, 2111 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`131 is a member as 1317131 and 71317 are both prime.`
	CROSSREFS	`Cf. A090262, A090263, A090265.` `Sequence in context: A134951 A164294 A155924 this_sequence A132254 A087832 A140623` `Adjacent sequences: A090261 A090262 A090263 this_sequence A090265 A090266 A090267`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 28 2003`
	EXTENSIONS	`More terms from mohammed bouayoun (bouyao(AT)wanadoo.fr), Feb 02 2004`

page 1

Search completed in 0.002 seconds

Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

AT&T Labs Research