A116519 Primes which stay prime when the end digits (on both sides) are repeated once.

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

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 A357075 * 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