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A096237
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Number of n-digit base-4 deletable primes.
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0
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2, 3, 9, 26, 75, 213, 615, 1853, 5854, 18664, 61248, 205300, 698575, 2409598, 8408050
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 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
| Cf. A080608, A080603, A096235-A096246.
Sequence in context: A056198 A143742 A038523 * A177928 A057231 A178028
Adjacent sequences: A096234 A096235 A096236 * A096238 A096239 A096240
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KEYWORD
| nonn,base,more
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AUTHOR
| Michael Kleber (michael.kleber(AT)gmail.com), Feb 28 2003
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EXTENSIONS
| 10 more terms from Ryan Propper (rpropper(AT)stanford.edu), Jul 19 2005
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