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Search: id:A096240
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| A096240 |
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Number of n-digit base-7 deletable primes. |
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+0
1
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| 3, 7, 21, 59, 184, 534, 1620, 4889, 15607, 50138, 165569, 551580, 1860565, 6345080
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A prime p is a base-b deletable prime if when written in base b it has the property that removing some digit leaves either the empty string or another deletable prime. "Digit" means digit in base b.
Deleting a digit cannot leave any leading zeros in the new string. For example, deleting the 2 in 2003 to obtain 003 is not allowed.
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CROSSREFS
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Cf. A080608, A080603, A096235-A096246.
Adjacent sequences: A096237 A096238 A096239 this_sequence A096241 A096242 A096243
Sequence in context: A047087 A104779 A091650 this_sequence A035080 A091486 A056779
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KEYWORD
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nonn,more
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AUTHOR
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Michael Kleber (kleber(AT)brandeis.edu), Feb 28 2003
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EXTENSIONS
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9 more terms from Ryan Propper (rpropper(AT)stanford.edu), Jul 19 2005
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