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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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Solution No Subject | Comment 1 of 12

258 + 1 is equal to the integer 288230376151711745 which, by ending in a 5, is obviously divisible by 5 and thus an integer. (258 + 1)/5 is also the certified prime 57646075230342323.

See correction in later post, though 57646075230342323 is a certified prime, (258 + 1)/5 is not as it is equal to 57646075230342349, a composite number.

Edited on April 10, 2007, 8:19 pm
  Posted by Dej Mar on 2007-04-10 13:09:50

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