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A048134
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Number of colors that can mixed with up to n units of yellow, blue, red.
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4
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0, 3, 6, 13, 22, 40, 55, 88, 118, 163, 205, 280, 334, 436, 517, 625, 733, 901, 1018, 1225, 1381, 1591, 1786, 2083, 2287, 2617, 2887, 3238, 3544, 4006, 4306, 4831, 5239, 5749, 6205, 6817, 7267, 8005, 8572, 9280, 9880, 10780, 11374, 12361
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..1000
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FORMULA
| a(n) = number of triples (i, j, k) with 1 <= i+j+k <= n and gcd(i, j, k) = 1.
Cumulative sums of A048240(k) for k>0.
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EXAMPLE
| a(2)=6: primary and secondary colors (Y^1, B^1, R^1, Y^1*B^1, Y^1*R^1, B^1*R^1).
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CROSSREFS
| Two colors gives A005728.
Cf. A048240, A048241.
Sequence in context: A034734 A019079 A178097 * A058397 A174369 A022811
Adjacent sequences: A048131 A048132 A048133 * A048135 A048136 A048137
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KEYWORD
| nonn,nice,easy
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AUTHOR
| Jurjen N. E. Bos (J.Bos at Interpay-ISS dot demon dot nl)
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EXTENSIONS
| More terms from Robin Trew (trew(AT)hcs.harvard.edu).
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