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A116519 Primes which stay prime when the end digits (on both sides) are repeated once. 1
131, 139, 163, 167, 193, 211, 227, 251, 269, 277, 281, 331, 337, 353, 359, 463, 541, 563, 571, 593, 653, 673, 761, 769, 797, 821, 881, 937, 983, 1031, 1093, 1097, 1153, 1279, 1301, 1427, 1429, 1459, 1483, 1549, 1609, 1693, 1783, 1787, 1789, 1879, 1931 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

EXAMPLE

The derived numbers 11311,11399,11633,11933,22111,22277,...are also primes.

MATHEMATICA

FromDigits /@ Select[IntegerDigits@Prime@Range[400], PrimeQ@FromDigits@Flatten@{First@#, #, Last@#} &] - Giovanni Resta, Apr 04 2006

CROSSREFS

Sequence in context: A050671 A095317 A084549 * A139646 A139970 A159256

Adjacent sequences:  A116516 A116517 A116518 * A116520 A116521 A116522

KEYWORD

nonn,base

AUTHOR

Lekraj Beedassy, Mar 25 2006

EXTENSIONS

More terms from Giovanni Resta, Apr 04 2006

STATUS

approved

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Last modified March 23 04:46 EDT 2019. Contains 321422 sequences. (Running on oeis4.)