id:A090265 - OEIS Search Results

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Numbers n such that the strings n9n and 9n9 are both prime.

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4

1, 19, 41, 43, 47, 61, 67, 71, 73, 83, 107, 149, 211, 217, 221, 269, 277, 319, 437, 443, 523, 547, 553, 607, 619, 647, 679, 697, 817, 863, 877, 899, 1171, 1283, 1297, 1379, 1481, 1547, 1621, 1853, 1867, 1967, 1993, 1997, 2021, 2053, 2107, 2357, 2359, 2393 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`41 is a member as 41941 and 9419 are both prime.`
	CROSSREFS	`Cf. A090262, A090263, A090264.` `Adjacent sequences: A090262 A090263 A090264 this_sequence A090266 A090267 A090268` `Sequence in context: A128677 A065349 A085778 this_sequence A049485 A019393 A029489`
	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`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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