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A100371
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a(n) = 2^phi(n) - 1 = A066781(n) - 1.
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7
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1, 1, 3, 3, 15, 3, 63, 15, 63, 15, 1023, 15, 4095, 63, 255, 255, 65535, 63, 262143, 255, 4095, 1023, 4194303, 255, 1048575, 4095, 262143, 4095, 268435455, 255, 1073741823, 65535, 1048575, 65535, 16777215, 4095, 68719476735, 262143, 16777215, 65535
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OFFSET
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1,3
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COMMENTS
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Number of nonempty subsets of reduced residue system [RRS(n)] modulo n.
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LINKS
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FORMULA
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MAPLE
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MATHEMATICA
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Table[2^EulerPhi[n] - 1, {n, 1, 50}]
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PROG
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(Python)
from sympy import totient
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CROSSREFS
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KEYWORD
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easy,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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