Posers and Puzzles

Posers and Puzzles

2007

Standard memberMathurine
Posers and Puzzles 18 Apr '07 15:15
  1. M
    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. D
    Standard memberDeepThought
    Losing the Thread
    Quarantined World
    Joined
    27 Oct '04
    Moves
    87415
    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. M
    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. e
    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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