Slee92 Slee92
  • 23-02-2020
  • Mathematics
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Why is p2+1 is always an even number

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Аноним Аноним
  • 23-02-2020

Answer:

Most prime numbers are odd. If p is odd, p2 is also odd, and then p2 + 1 is even. Because p > 1, p2 + 1 > 2, and an even number greater than 2 cannot be prime. So p has to be even, then p = 2 (and p2 + 1 = 5 is also prime).

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