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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

%I #2 Mar 31 2012 10:26:32

%S 2,3,5,11,13,23,31,53,83,101,103,113,131,181,251,311,313,331,383,521,

%T 811,823,853,881,883,1013,1021,1031,1033,1051,1103,1123,1153,1181,

%U 1223,1231,1283,1301,1303,1381,1531,1553,1583,1801,1811,1831,2003,2011,2053

%N 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.

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

%Y Cf. A018847.

%K nonn,base

%O 1,1

%A _David Nacin_, May 24 2010

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Last modified March 28 08:12 EDT 2024. Contains 371236 sequences. (Running on oeis4.)