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A109474
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a(n) = least positive integer > a(n-1) and not equal to a(i)+a(j)+a(k) for 1<=i<=j<=k<=n.
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1
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1, 3, 4, 13, 14, 23, 24, 33, 34, 43, 44, 53, 54, 63, 64, 73, 74, 83, 84, 93, 94, 103, 104, 113, 114, 123, 124, 133, 134, 143, 144, 153, 154, 163, 164, 173, 174, 183, 184, 193, 194, 203, 204, 213, 214, 223, 224, 233, 234, 243, 244, 253, 254, 263, 264, 273, 274, 283, 284
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| This was the original definition of A026476, but the terms there did not match this definition.
Conjecture: Except for the first term, a(n)=10*n-a(n-1)-23 (with a(2)=3) [From Vincenzo Librandi, Dec 07 2010]
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FORMULA
| max{1, 5*n-9+2*(-1)^n}.
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CROSSREFS
| Sequence in context: A082197 A138101 A095790 * A053910 A105074 A087884
Adjacent sequences: A109471 A109472 A109473 * A109475 A109476 A109477
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KEYWORD
| nonn
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AUTHOR
| Bela Bajnok (bbajnok(AT)gettysburg.edu), Aug 10 2005
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