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Search: id:A159064
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| A159064 |
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Emirps which remain primes when rotated by 180 degrees on a digital clock display. |
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+0
1
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| 199, 1061, 1091, 1109, 1181, 1601, 1669, 1811, 1901, 10061, 10069, 10091, 10909, 11909, 16001, 18691, 18911, 19001, 19661, 19801, 101119, 101611, 106681, 106699, 106861, 108881, 109609, 109891, 110119, 110881, 110989, 111119, 111869, 111919, 116911
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The sequence contains all bemirps A048895.
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FORMULA
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Intersection of A048890 and A006567.
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EXAMPLE
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1109 is an emirp (prime, and the reverse 9011 is also prime), it contains only digits 0,1,6,8 or 9 and can be rotated to form 6011, which is also prime. So 1109 is in the sequence.
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CROSSREFS
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Cf. A145750.
Sequence in context: A159657 A142570 A155507 this_sequence A117594 A052188 A086977
Adjacent sequences: A159061 A159062 A159063 this_sequence A159065 A159066 A159067
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KEYWORD
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base,nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Apr 04 2009
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EXTENSIONS
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18691 and 18911 inserted, extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 05 2009
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