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| Find a Frenzy Fibo (Posted on 2014-08-06) |
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Find the smallest Fibonacci number with a prime subscript but not prime itself.
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Submitted by Ady TZIDON
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Solution:
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f(2)=1 1 is not a prime number, anwering the puzzle.
1 cannot be called composite.
F(19) = 4181 = 37 * 113 is the smallest composite F. number with prime index.
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