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Search: id:A090157
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| A090157 |
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Primes of the form identical digits preceded by a 9. |
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+0
1
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| 97, 911, 977, 97777, 911111, 97777777777777777777, 911111111111111111111, 97777777777777777777777777777, 911111111111111111111111111111111111111111
(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[{9}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 50}], 1], PrimeQ[ # ] &]
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CROSSREFS
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Cf. A090148, A090149, A090150, A090151, A090152, A090153, A090154, A090155, A090157.
Sequence in context: A133535 A045715 A113891 this_sequence A162674 A070845 A093297
Adjacent sequences: A090154 A090155 A090156 this_sequence A090158 A090159 A090160
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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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