[CODE]13 <- year is prime
-1 <-take away month
-1 <-take away day
-------------------
11 <- prime
[/CODE]

mulltiply year by day and divide by month, we still are in the same year!

2013 is one of the rare years whose Gregorian year number has "0", "1", "2", and "3".

Next one will be 2031, then no more until 2103.

[QUOTE=cheesehead;323429]2013 is one of the rare years whose Gregorian year number has "0", "1", "2", and "3".[/QUOTE]
And today added a "4" in the date.

Today's date: 5/1/13 (Euro style)
5=1+1+3

[CODE] 20 <-century
-13 <-years
- 1 <-month
---------------
6 <-day[/CODE]

(2013[sup]2[/sup]-911)/2 is prime.

((2013[sup]61[/sup]-1)/2012)-61 is divisible by 503 (a factor of 2012).

(20-13)/7=1

2+0+1+3+1=7

Today is (over here) 1/8/13, and (1+1)^3 = 8.

Over there, it's 8/1/13, so 8 = (1+1)^3.

oh well, this one is too good to ignore, even a day late

yesterday: 1/12/13

11213 is the smallest five digit Mersenne prime exponent

[QUOTE=davar55;324573]yesterday: 1/12/13

11213 is the smallest five digit Mersenne prime exponent[/QUOTE]
Yesterday was a busy day for me, but I was going to post:

1+12=13