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A366667
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a(n) = phi(9^n+1), where phi is Euler's totient function (A000010).
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11
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1, 4, 40, 288, 3072, 23600, 259200, 1847104, 21523360, 152845056, 1700870400, 12550120000, 130459631616, 997562438080, 11159367815680, 81159501312000, 926510094425920, 6670865700716544, 73205598106368000, 540340585126398016, 5691215305506816000
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OFFSET
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0,2
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(PARI) {a(n) = eulerphi(9^n+1)}
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CROSSREFS
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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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