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A167797
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Numbers with primitive root 10.
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21
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7, 17, 19, 23, 29, 47, 49, 59, 61, 97, 109, 113, 131, 149, 167, 179, 181, 193, 223, 229, 233, 257, 263, 269, 289, 313, 337, 343, 361, 367, 379, 383, 389, 419, 433, 461, 487, 491, 499, 503, 509, 529, 541, 571, 577, 593, 619, 647, 659, 701, 709, 727, 743, 811
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OFFSET
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1,1
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COMMENTS
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Numbers n such that the decimal expansion of 1/n has period phi(n). For example, 1/49 has period 42.
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LINKS
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MATHEMATICA
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pr=10; Select[Range[2, 2000], MultiplicativeOrder[pr, # ] == EulerPhi[ # ] &]
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CROSSREFS
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Cf. A001913 (primes with primitive root 10)
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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