In the past I've complained about Uri Geller's (and others) fascination with the number 11 which, depending on who you ask, is a sign of peace, war, or 1,111 spirits or angels who are making themselves known through 11 (and also the time 11:11).
For example, I wrote about the occurrence of the sum 11 on clocks (and airline seats) and the relationship with Benford's Law.
One aspect of the 11 fascination is looking for 11 in sums of digits (classic numerology). For example, Geller has September 11th is the 254th day of the year: 2+5+4 = 11 The date of the attack: 9/11 - 9 + 1 + 1 = 11.
So, in general a good question is 'how likely is 11 to appear as the sum of single digits?'. To answer that I calculated the number of times all sums of two and three digits (i.e. add any two from 0 through 9, or any three from 0 through 9) occur. Here are the graphs.
And, also 13 people at the Last Supper. Jewish children mature at age 13. 13 witches in a coven. 13 cards in a suit.
It must mean something.
Also, 13 letters in Graham-Cumming. Bow down, I am the prophet of 13.