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A107647
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Euler's totient function applied to tribonacci numbers.
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1
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1, 1, 1, 2, 6, 12, 8, 20, 54, 148, 136, 144, 612, 1200, 1344, 2448, 10506, 16848, 13824, 22000, 83232, 148716, 205368, 377736, 920160, 1694088, 1880304, 3290112, 14839968, 22472640, 17805312, 42407136, 117876096, 327661128, 178588800, 561863168, 1604383200
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OFFSET
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2,4
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LINKS
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FORMULA
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MATHEMATICA
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F[1] = 0; F[2] = 1; F[3] = 1; F[n__] := F[n] = F[n - 1] + F[n - 2] + F[n - 3]; Table[EulerPhi[F[n]], {n, 2, 50}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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First term 0 removed and offset corrected by Amiram Eldar, Mar 02 2020
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STATUS
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approved
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