A178317 - OEIS

A178317

Primes with the property that if the digits are written digital clock style and the number is reflected across a horizontal line through the middle of the number, the result is still prime.

2, 3, 5, 11, 13, 23, 31, 53, 83, 101, 103, 113, 131, 181, 251, 311, 313, 331, 383, 521, 811, 823, 853, 881, 883, 1013, 1021, 1031, 1033, 1051, 1103, 1123, 1153, 1181, 1223, 1231, 1283, 1301, 1303, 1381, 1531, 1553, 1583, 1801, 1811, 1831, 2003, 2011, 2053

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

EXAMPLE

For example when 251 is reflected it becomes 521 which is also a prime, but a different one.

CROSSREFS

Cf. A018847.

Sequence in context: A036960 A133783 A036958 * A032024 A131741 A277098

Adjacent sequences: A178314 A178315 A178316 * A178318 A178319 A178320

KEYWORD

nonn,base

AUTHOR

David Nacin, May 24 2010

STATUS

approved