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31 is a prime number from 1-100. 31 has 2 factors, 1 and 31. It is said to be a number wherein when digits are added together, they make a composite number. It is the eleventh prime number, and the eleventh prime number from 1-100. 
31

Proofs

  • 1 can divide 31
  • 2 cannot
  • 3 cannot
  • 4 - 28 cannot
  • 29 cannot
  • 30 also cannot
  • 31 can divide itself
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