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Which number best completes the sequence 1 5 16 31 51?

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Anonymous

∙ 13y ago
Updated: 8/20/2019

81 is a good continuation although, since the seqeunce continues forever, it cannot be said to be completion.

The rationale for 81 is

u(n) = (n4 - 13n3 + 74n2 - 122n + 66)/6 for n = 1 ,2, 3, ...

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∙ 13y ago
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