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A366618
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a(n) = phi(5^n+1), where phi is Euler's totient function (A000010).
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10
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1, 2, 12, 36, 312, 1040, 7200, 25088, 183808, 557928, 4396800, 15333120, 121680000, 406812744, 2817007200, 8558784000, 76264519680, 254230063200, 1710194342400, 6349120596480, 47334145996800, 127169887444992, 1088029470747648, 3889097389599864
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OFFSET
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0,2
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LINKS
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PROG
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(PARI) {a(n) = eulerphi(5^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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