20 is not a term in the Fibonacci series.
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the first seven Fibonacci numbers are 1,1,2,3,5,8,13. 13 is a Fibonacci number.
The twelfth Fibonacci number is 144.
123 is not a Fibonacci number.
21
The 5th prime number is 11, and the 5th Fibonacci number is 5.The sum will be 11 + 5 = 16