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A145750
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Primes which become emirps when rotated by 180 degrees on a digital clock display.
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1
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The sequence contains all bemirps A048895.
Subsequence of A057770. [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 05 2009]
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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.
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CROSSREFS
| Sequence in context: A204538 A204534 A171394 * A105978 A171395 A069426
Adjacent sequences: A145747 A145748 A145749 * A145751 A145752 A145753
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KEYWORD
| nonn,base
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Apr 04 2009
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EXTENSIONS
| 1109 removed, 6011 inserted etc. by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 05 2009
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