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+ In 1987, Chris K. Caldwell defined a deletable prime to be a prime in which you can delete the digits one at a time in some order and get a prime at each step:

  • 410256793
  • 41256793
  • 4125673
  • 415673
  • 45673
  • 4567
  • 467
  • 67
  • 7




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