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A054602
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a(n) = Sum_{d|3} phi(d)*n^(3/d).
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16
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0, 3, 12, 33, 72, 135, 228, 357, 528, 747, 1020, 1353, 1752, 2223, 2772, 3405, 4128, 4947, 5868, 6897, 8040, 9303, 10692, 12213, 13872, 15675, 17628, 19737, 22008, 24447, 27060, 29853, 32832, 36003, 39372, 42945, 46728, 50727, 54948
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OFFSET
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0,2
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COMMENTS
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Continued fraction [n,n,n] = (n^2+1)/(n^3+2n) = (n^2+1)/a(n); e.g., [7,7,7] = 50/357. - Gary W. Adamson, Jul 15 2010
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LINKS
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FORMULA
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MATHEMATICA
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nterms=100; Table[n^3+2n, {n, 0, nterms}] (* Paolo Xausa, Nov 25 2021 *)
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PROG
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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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