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0, 1, 1, 3, 1, 6, 1, 7, 4, 8, ?, ?, ?

Category:Series
Submitted By:shenqiang
Fun:** (1.77)
Difficulty:**** (3.11)



0, 1, 1, 3, 1, 6, 1, 7, 4, 8, ?, ?, ?

Answer:

1, 16, 1.

The nth term is the sum of the proper divisors of n. The prime numbers have 1 as their only proper divisor.

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