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A145852
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Primes of the form k followed by a 0 and k 9's.
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1
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109, 2099, 409999, 1909999999999999999999, 2809999999999999999999999999999, 41099999999999999999999999999999999999999999, 7609999999999999999999999999999999999999999999999999999999999999999999999999999
(list; graph; refs; listen; history; internal format)
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