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Q: Which is not Fibonacci number 89 or 123?

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No, it is not.

89

The 9th number in the Fibonacci Sequence is 34, and the 10th number in the Fibonacci sequence is 89.

144

89

34, 55, 89, 144 is a portion of the Fibonacci sequence. The next number is 89 + 144 which is 233.

No, 38 is not a Fibonacci number. The Fibonacci numbers closest to 38 are 34 and 55. 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, etc.

Answer 144 which is F(12) Reason 55 and 89 are the 10th and 11th Fibonacci numbers, If we add these we have 144 which is the 12 Fibonacci number and is a perfect square. I am using F(0) as the 0 Fibonacci number and F(1) as the first.

123

He worked on the Fibonacci number. It goes like this: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, . . .

89123 - 78576 = 10547

The first few Fibonacci primes are 2, 3, 5, 13, 89. Fibonacci primes with thousands of digits have been found but it is not known whether there are infinitely many (Wikipedia, see link).

the first seven Fibonacci numbers are 1,1,2,3,5,8,13. 13 is a Fibonacci number.

The 365th Fibonacci number is 8531073606282249384383143963212896619394786170594625964346924608389878465365.

the 18th of Fibonacci number is 2584.

The 100th Fibonacci number is 354,224,848,179,261,915,075.

The twelfth Fibonacci number is 144.

The 22nd Fibonacci number is 17,711

34 subtracted from 123

Yes - 5 is the fifth Fibonacci number.

Yes. 610 is the 15th number in the Fibonacci sequence.

The 20th Fibonacci number in the sequence is 6,765.

The 16th number of the Fibonacci sequence is 987.

Leonardo Fibonacci discovered the number sequence which is named after him.

123