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A066792
a(n) = phi(n^3 + n^2 + n + 1).
1
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
OFFSET
0,2
LINKS
FORMULA
a(n) = A000010(A053698(n)). - Michel Marcus, Sep 06 2022
MATHEMATICA
Prepend[EulerPhi[Total[#^Range[0, 3]]]&/@Range[45], 1] (* Harvey P. Dale, Feb 19 2011 *)
PROG
(PARI) { for (n=0, 1000, write("b066792.txt", n, " ", eulerphi(n^3 + n^2 + n + 1)) ) } \\ Harry J. Smith, Mar 27 2010
CROSSREFS
Cf. A000010 (phi), A053698.
Sequence in context: A162584 A100243 A026523 * A096195 A094014 A098232
KEYWORD
nonn,easy
AUTHOR
Benoit Cloitre, Jan 18 2002
STATUS
approved