Solve for a_18
a_{18}=233
Assign a_18
a_{18}≔233
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a_{18}=12+17\times 13
Subtract 1 from 18 to get 17.
a_{18}=12+221
Multiply 17 and 13 to get 221.
a_{18}=233
Add 12 and 221 to get 233.
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