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A366685
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a(n) = phi(11^n-1), where phi is Euler's totient function (A000010).
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15
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4, 32, 432, 3840, 64400, 373248, 7613424, 56217600, 765889344, 6913984000, 114117380608, 599824465920, 13796450740800, 98909341090560, 1356399209088000, 11341872916070400, 202178811399717504, 1171410130065973248, 24463636179365818512, 176391086415667200000
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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EulerPhi[11^Range[30] - 1]
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PROG
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(PARI) {a(n) = eulerphi(11^n-1)}
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CROSSREFS
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phi(k^n-1): A053287 (k=2), A295500 (k=3), A295501 (k=4), A295502 (k=5), A366623 (k=6), A366635 (k=7), A366654 (k=8), A366663 (k=9), A295503 (k=10), this sequence (k=11), A366711 (k=12).
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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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