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A066792
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a(n) = phi(n^3 + n^2 + n + 1).
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1
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1, 2, 8, 16, 64, 48, 216, 160, 288, 320, 1000, 480, 1344, 768, 1568, 1792, 4096, 1344, 4320, 2880, 4800, 3840, 8448, 3328, 11520, 7488, 12168, 6912, 17472, 6720, 24960, 13824, 16000, 13824, 25344, 14688, 46656, 19584, 26112, 24320, 64000, 19488
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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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Prepend[EulerPhi[Total[#^Range[0, 3]]]&/@Range[45], 1] (* Harvey P. Dale, Feb 19 2011 *)
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PROG
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(PARI) { for (n=0, 1000, write("b066792.txt", n, " ", eulerphi(n^3 + n^2 + n + 1)) ) } \\ Harry J. Smith, Mar 27 2010
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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