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A090262 Numbers n such that the strings n1n and 1n1 are both prime. 3
3, 9, 17, 29, 47, 51, 81, 87, 113, 117, 131, 141, 201, 239, 291, 333, 359, 371, 393, 443, 459, 489, 509, 539, 573, 623, 663, 681, 749, 819, 821, 873, 903, 947, 1071, 1077, 1161, 1269, 1533, 1563, 1589, 1613, 1637, 1673, 1767, 1773, 1821, 1841, 1883, 1959, 1977 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

EXAMPLE

9 is a member as 919 and 191 are both prime.

CROSSREFS

Cf. A090263, A090264, A090265.

Sequence in context: A018466 A171152 A035107 * A190815 A006459 A049778

Adjacent sequences:  A090259 A090260 A090261 * A090263 A090264 A090265

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 28 2003

EXTENSIONS

More terms from mohammed bouayoun (bouyao(AT)wanadoo.fr), Feb 02 2004

STATUS

approved

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Last modified June 28 20:37 EDT 2017. Contains 288840 sequences.