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A089347
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Primes of the form identical digits followed by a 1.
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6
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11, 31, 41, 61, 71, 331, 661, 881, 991, 2221, 3331, 4441, 6661, 33331, 99991, 333331, 3333331, 9999991, 33333331, 6666666661, 44444444441, 555555555551, 5555555555551, 7777777777771, 222222222222222221, 333333333333333331
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[ FromDigits /@ Flatten[ Table[ PadLeft[{1}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 18}], 1], PrimeQ[ # ] &] (* Robert G. Wilson v, Nov 15 2003 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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