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Search: id:A090149
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| A090149 |
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Primes of the form identical digits preceded by a 1. |
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+0
4
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| 11, 13, 17, 19, 199, 1777, 1999, 199999, 19999999, 1777777777, 17777777777777, 1333333333333333, 1111111111111111111, 11111111111111111111111, 199999999999999999999999999, 1999999999999999999999999999
(list; graph; listen)
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OFFSET
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1,1
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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 this_sequence A089691 A036979 A036977
Adjacent sequences: A090146 A090147 A090148 this_sequence 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 (rgwv(AT)rgwv.com), Nov 22 2003
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