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Search: id:A129864
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| A129864 |
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Numbers that are both lucky and emirp. |
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+0
1
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| 13, 31, 37, 73, 79, 739, 769, 937, 991, 1009, 1021, 1201, 1231, 1249, 1471, 1597, 1723, 1831, 1879, 1933, 3049, 3109, 3121, 3163, 3301, 3433, 3571, 3613, 3697, 3889, 7207, 7321, 7459, 7507, 7603, 7687, 7717, 7951, 7963, 9349, 9403, 9421, 9547, 9613, 9643
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A000959 INTERSECTION A006567. a(n) is n element of A000959 AND a(n) is an element of A000040 AND R(a(n)) = A004086(a(n)) is an element of A000040.
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EXAMPLE
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a(9) = 1009 because 1009 is a lucky number A000959(154) and 1009 is an emirp because 1009 is prime and R(1009) = 9001 is prime (but is not lucky).
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CROSSREFS
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Cf. A000040, A000959, A004086, A006567, A031157.
Adjacent sequences: A129861 A129862 A129863 this_sequence A129865 A129866 A129867
Sequence in context: A040050 A040086 A023274 this_sequence A080387 A097443 A100589
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KEYWORD
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base,easy,nonn,less
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), May 23 2007
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EXTENSIONS
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Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 12 2007
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