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Search: id:A003684
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| A003684 |
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Number of n-digit reversible primes (or emirps) with distinct digits. |
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+0
10
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OFFSET
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1,1
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EXAMPLE
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13, 17, 31, 37, 71, 73, 79 and 97 are reversible primes (emirps), so a(2)=8.
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CROSSREFS
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Cf. A006567, A007628, A046732, A048051, A048052, A048053, A048054, A048895.
Sequence in context: A058855 A057583 A129788 this_sequence A075688 A026596 A083504
Adjacent sequences: A003681 A003682 A003683 this_sequence A003685 A003686 A003687
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KEYWORD
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nonn,fini,full,base,easy,nice
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AUTHOR
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Harvey P. Dale (hpd(AT)apscompany.com) and Jud McCranie (j.mccranie(AT)comcast.net)
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EXTENSIONS
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Typo in example corrected by David Ritterskamp (dritters(AT)usi.edu), Mar 24 2008
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