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A004023
Indices of prime "repunits": numbers n such that 11...111 = (10^n - 1)/9 is prime.
(Formerly M2114)
+0
67
2, 19, 23, 317, 1031, 49081, 86453, 109297
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.
AT&T Labs Research
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