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A319214
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a(n) = phi(n^5 - 1)/5 where phi is A000010.
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4
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6, 22, 120, 280, 1240, 1120, 5400, 5280, 12960, 12880, 45240, 24752, 90240, 59160, 96000, 141984, 346880, 163800, 540000, 326720, 588984, 585120, 1523280, 582400, 1728000, 1203840, 2294712, 1758096, 4692408, 1388000, 6480000, 3787200, 5416800, 4783680, 7440000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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2,1
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LINKS
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MATHEMATICA
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Table[EulerPhi[n^5-1]/5, {n, 2, 40}] (* Harvey P. Dale, Feb 09 2019 *)
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PROG
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(PARI) {a(n) = eulerphi(n^5-1)/5}
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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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