The Imagisterium
23May/11Off

Answers to “Nerdy fun with dates and primes”

Answers to the questions in "Nerdy fun with dates and primes":

  1. What was the last date to be a prime number in both notations?
    2010-08-09, which translates to 20100809 and 2010221
    (the only such date in 2010)
  2. What will be the next date that is a prime number in both notations?
    2012-03-23, which translates to  20120323 and 2012083
    (the only such date in 2012)
  3. What is the most recent past year with more than one date which is prime in both notations?
    2008 had 3 such dates: 2008-01-03, 2008-10-03, and 2008-10-23.
  4. What is the nearest future year with more than one date which is prime in both notations?
    2013 will have 3 such dates: 2013-08-29, 2013-11-03, and 2013-11-09
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