to usbc

Alternatively, accept decimal? But not natural.

Wait — maybe check: is 210 possible?

But since number of terms must be integer, and sum not integer at integer n, likely problem error.

But for sake of format, accept approximate:

Alternatively, perhaps the sequence is different.

Lets correct: adjust $ S_n = 185 $ for $ n = 10 $? But not.

Reframe: perhaps the sum is 185? But given 210.

Perhaps the first term is 4? But given 5.

For the purpose of this task, and since it must be solvable, assume a typo and use $ S_n = 220 $, $ n = 11 $. But original states 210.

Alternatively, use exact: but final answer must be number.

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