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Is it, or is it not? (Posted on 2007-04-10) Difficulty: 4 of 5
Is (258+1)/5 an integer? A prime?

See The Solution Submitted by Federico Kereki    
Rating: 3.6667 (3 votes)

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Had fun | Comment 11 of 12 |
I'm not a computer expert, and had a glitch with mine - so used calculator to reach 29th power -- then did rest by hand. Good exercise to do something like this once in awhile - and got 288230376151711744 the first time; + 1 = this sum, ending in 5, and
an integer, not prime, divisible by 5.
  Posted by CharleyA. on 2007-04-12 00:14:58
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