You may have a need today to assign a file name that includes the year, the month, and the day.  To have the computer keep things in time-sequence, that is the order you use – YYMMDD.

So, enjoy today’s assignments:

13 12 11

Last week the only cool date was at the beginning (12/1/13).  This week the only cool date is at the end (12/14/13).

Go up two from 12 to 14, and come back one to 13…. A half-back day.

 

Today, 12/01/13 is the one cool number date this week.

 12 + 1 = 13

Enjoy December, even though cool dates are sparse this year.  You may recall that last year had a plethora of multiples, since 12 is divisible by 2,3,4, and 6.  You don’t get those when the year (13) is prime.

Today is Thanksgiving in the United States, the fourth Thursday in November.  It is also the first day of Hanukkah, the Jewish festival of lights, which celebrates the rededication of the Second Temple in the 2^nd century BC.  Hanukkah is based on the Hebrew calendar and may occur at any time from late November to late December in the Gregorian calendar.

You probably missed the only other time this happened, in 1888 (remember Thanksgiving has not been around that long). The NEXT occurrence is not until 79,811, according to calculations by physicist Jonathan Mizrahi.  Don’t hold your breath!

The last All Prime day of the month (and the year!) is 11/29/13.

The other cool date this week is today, 11/24/13.  24 – 11 = 13

Three more All Prime days this week:

                                11/17/13

                                11/19/13

                                11/23/13

 

 

Today, 11/12/13, is a great day partly because it is a sequence and mostly because it is my sister Cindy’s birthday. My other sister Elaine had her sequence day three years ago on 8/9/10. 

Cindy pointed out that lots of people are lining up to get married next year on 12/13/14 thinking it is the last sequence day of the century.  Just for some precision, note that it is the last sequence of one; the last sequence of any kind will be 12/31/50 – a sequence of 19.

This gives some hope to my brother Scott, who can claim 8/17/26 as his sequence (of 9) day.

Alas, I am not sure what someone with a November 5 birthday is to do.  11/5/17 has all the numbers for a sequence of 6 (and a halfback day!), but in the wrong order.  11/5/-1 might be interpreted as 11/5/99 in some negativo universe. 

I guess some birthdays just don’t get sequence days.

There are three DIFFERENT kinds of days this week!

First and foremost, 11/12/13 is not only a sequence, it is my sister Cindy’s birthday.  Happy birthday, Sister Cindy!

There are two dates, 11/11/13 and 11/13/13, that are all prime numbers.  And we all remember fondly (but sadly) the Veteran’s Day MSU basketball game on an aircraft carrier on 11/11/11 (MSU lost).

The third type is a half-back day – 11/15/13.  Go up four from 11 to fifteen and come half-way (2) back to 13!

So many primes this week!  Three different dates are all prime:

                11/03/13

                11/05/13

                11/07/13

For the second week in a row, there is just one date, but it has two designations.  11/02/13 consists of all prime numbers, and 11 + 2 = 13.