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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. 1
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 A096650

Adjacent sequences:  A178314 A178315 A178316 * A178318 A178319 A178320

KEYWORD

nonn,base

AUTHOR

David Nacin, May 24 2010

STATUS

approved

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Last modified November 25 16:38 EST 2014. Contains 249998 sequences.