[adorable]

So today is an international prime day because 291113 112913 20131129 are all primes

Today could also have been a "perfect prime day" if MM, DD, YY and YYYY had been prime (in addition to the above). But it's not the case...

11 -> is prime

29 -> is prime

13 -> is prime

2013 -> not prime (3 x 11 x 61)

Too bad! We will have to wait another 16 years before we have a perfect prime day...

[ruttiger]

ya, but each of the factors of 2013 is prime, so that's gotta mean something, right?

[gnur]

Isn't always possible to deconstruct the factors of a number in only primes?

[s-phi-nl]

I think ruttiger may mean that 2013 is the product of three unique primes (e.g. 30=2 * 3 * 5 would be another example, but 50=5^2 * 2 is not).