Posers and Puzzles

Posers and Puzzles

  1. Standard memberMathurine
    sorozatgyilkos
    leölés ellenfeleim
    Joined
    15 Jul '06
    Moves
    40507
    18 Apr '07 15:15
    2007 is divisible by 9. If a 1 be added onto the end... 20071, the number is prime. What can be added to the end of 20071, to obtain another prime?

    What delights can be found beyond?
  2. Standard memberDeepThought
    Losing the Thread
    Cosmopolis
    Joined
    27 Oct '04
    Moves
    80321
    18 Apr '07 15:521 edit
    Brute force numerical calculation tells me to keep adding 3s. Is there a trick to see it without a computer?
  3. Standard memberMathurine
    sorozatgyilkos
    leölés ellenfeleim
    Joined
    15 Jul '06
    Moves
    40507
    18 Apr '07 16:041 edit
    Originally posted by DeepThought
    Brute force numerical calculation tells me to keep adding 3s. Is there a trick to see it without a computer?
    probably... 😉
  4. Standard memberemanon
    Student
    Leuven
    Joined
    21 Apr '07
    Moves
    19119
    21 Apr '07 16:04
    Originally posted by Mathurine
    probably... 😉
    well?...
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