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A039783
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phi(n) is equal to the product of the dual prime-power components of n-1 (i.e., A008477(n-1)).
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0
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5, 17, 51, 73, 109, 433, 17408, 21601, 121501, 1350001, 3294173, 9376762501
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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phi(17408) = 8192, 17407 = 13^2*103^1, (2^13)*(1^103) = 8192.
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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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