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Find a Frenzy Fibo (Posted on 2014-08-06) Difficulty: 2 of 5
Find the smallest Fibonacci number with a prime subscript but not prime itself.

  Submitted by Ady TZIDON    
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Solution: (Hide)
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.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some ThoughtsFor a similar problemCharlie2014-08-06 11:22:46
SolutionSolutiontomarken2014-08-06 10:19:08
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