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Search: id:A048241
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| A048241 |
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Number of colors that can mixed with n >= 0 units of yellow, blue, red. |
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+0
4
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| 1, 4, 7, 14, 23, 41, 56, 89, 119, 164, 206, 281, 335, 437, 518, 626, 734, 902, 1019, 1226, 1382, 1592, 1787, 2084, 2288, 2618, 2888, 3239, 3545, 4007, 4307, 4832, 5240, 5750, 6206, 6818, 7268, 8006, 8573, 9281, 9881, 10781, 11375, 12362
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..1000
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FORMULA
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a(n) = number of triples (i, j, k) with 0 <= i+j+k <= n and gcd(i, j, k) = 1.
a(n)=A048134(n)+1. - T. D. Noe, Jan 16 2007
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EXAMPLE
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a(2)=7: white, primary and secondary colors (null, Y^1, B^1, R^1, Y^1*B^1, Y^1*R^1, B^1*R^1).
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CROSSREFS
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Cf. A048134, A048240.
Sequence in context: A146678 A146417 A008370 this_sequence A003404 A139025 A128610
Adjacent sequences: A048238 A048239 A048240 this_sequence A048242 A048243 A048244
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KEYWORD
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nonn,easy,nice
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AUTHOR
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Jurjen N.E. Bos (J.Bos at Interpay-ISS dot demon dot nl), N. J. A. Sloane (njas(AT)research.att.com), Robin Trew (trew(AT)hcs.harvard.edu)
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