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A051912
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a[n] = smallest integer such that the sum of any three ordered terms a[k; k<n ] is unique.
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6
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0, 1, 4, 13, 32, 71, 124, 218, 375, 572, 744, 1208, 1556, 2441, 3097, 4047, 5297, 6703, 7838, 10986, 12331, 15464, 19143, 24545, 28973, 34405, 37768, 45863, 50876, 61371, 68302, 77917, 88544, 101916, 122031, 131624, 148574, 171236, 197814
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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EXAMPLE
| Three terms chosen from {0,1,4} can be 0+0+0; 0+0+1; 0+1+1; 1+1+1; 0+0+4; 0+1+4; 1+1+4; 0+4+4; 1+4+4; 4+4+4 are all distinct (3*4*5/6 =10 terms), so a[3]= 4 is the next integer of the sequence.
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CROSSREFS
| Cf. A025582, A036241, A062065.
Sequence in context: A184632 A011936 A037235 * A060099 A173277 A036420
Adjacent sequences: A051909 A051910 A051911 * A051913 A051914 A051915
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KEYWORD
| nonn,easy,nice
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AUTHOR
| Wouter Meeussen (wouter.meeussen(AT)pandora.be), Dec 17 1999
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EXTENSIONS
| More terms from Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jul 22 2001
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