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A090149
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Primes of the form identical digits preceded by a 1.
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4
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11, 13, 17, 19, 199, 1777, 1999, 199999, 19999999, 1777777777, 17777777777777, 1333333333333333, 1111111111111111111, 11111111111111111111111, 199999999999999999999999999, 1999999999999999999999999999
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..38
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MATHEMATICA
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Select[ FromDigits /@ Flatten[ Table[ PadRight[{1}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 40}], 1], PrimeQ[ # ] &]
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CROSSREFS
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Sequence in context: A045707 A032591 A088265 * A089691 A036979 A036977
Adjacent sequences: A090146 A090147 A090148 * A090150 A090151 A090152
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KEYWORD
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nonn,base
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AUTHOR
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Robert G. Wilson v, Nov 22 2003
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STATUS
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approved
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