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Search: id:A090150
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| A090150 |
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Primes of the form a string of identical digits preceded by a 2. |
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+0
2
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| 2, 23, 29, 211, 233, 277, 2111, 2333, 2777, 2999, 23333, 2999999, 29999999, 2777777777, 23333333333, 2111111111111, 2777777777777777, 23333333333333333, 2111111111111111111, 2777777777777777777
(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[{2}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 23}], 1], PrimeQ[ # ] &]
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CROSSREFS
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Adjacent sequences: A090147 A090148 A090149 this_sequence A090151 A090152 A090153
Sequence in context: A107148 A062653 A045708 this_sequence A106102 A053232 A065987
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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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