

A145750


Primes which become emirps when rotated by 180 degrees on a digital clock display.


1



661, 1061, 1091, 1181, 1601, 1811, 1901, 6011, 6991, 10061, 10091, 10861, 11681, 16001, 16981, 19001, 19961, 60601, 60611, 69001, 106861, 108161, 108881, 109891, 110881, 116881, 116911, 118081, 118861, 119101, 119611, 160861, 161611, 168601, 169691
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OFFSET

1,1


COMMENTS

The sequence contains all bemirps A048895.


LINKS



EXAMPLE

1109 is a prime. After 2D rotation it is 6011, which is prime. However, 6011 is not an emirp because 1106 is not prime. So 1109 is not in the sequence.


CROSSREFS



KEYWORD

nonn,base


AUTHOR



EXTENSIONS

1109 removed, 6011 inserted etc. by R. J. Mathar, Apr 05 2009


STATUS

approved



