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A027742
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a(n) = phi(4^n-1)/(2*n).
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0
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1, 2, 6, 16, 60, 144, 756, 2048, 7776, 24000, 120032, 276480, 1719900, 4741632, 17820000, 67108864, 336849900, 725594112, 4822382628, 11842560000, 57802864896, 200778006528, 998132265920, 2283043553280, 13122000000000, 44980696051200, 178118842613760
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Table[EulerPhi[4^n-1]/(2n), {n, 30}] (* Harvey P. Dale, May 01 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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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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