10-10-10 Multi Event - CO
This is also the October edition of the Denver Meet & Greet!
= 2 x 5
= 1 + 2 + 3 + 4
A triangular number.
= 1 + 3 + 6
So come on out and celebrate this event. Get caught up with some stories from old friends or learn some new stories from new friends. The stories will start around 6:00pm and will continue till 10:10. Bring your extra geocoins for a little informal trading too.
Some food will be provided but please come and have dinner and enjoy the evening. There will be a raffle this year and lost of prizes. The location serves food and beer.
10 in mathematics
Ten is a composite number, its proper divisors being 1, 2 and 5. Ten is the smallest noncototient, a number that cannot be expressed as the difference between any integer and the total number of coprimes below it.
Ten is the second discrete semiprime (2.5) and the second member of the (2.q) discrete semiprime family. Ten has an aliquot sum s(n) of 8 and is accordingly the first discrete semiprime to be in deficit. All subsequent discrete semiprimes are in deficit. The aliquot sequence for 10 comprises five members (10,8,7,1,0) with this number being the second composite member of the 7-aliquot tree.
It is the aliquot sum of only one number the discrete semiprime 14.
Ten is a semi-meandric number.
Ten is the sum of the first three prime numbers, of the four first numbers (1 + 2 + 3 + 4), of the square of the two first odd numbers and also of the first four factorials (0! + 1! + 2! + 3!). Ten is the eighth Perrin number, preceded in the sequence by 5, 5, 7.
A polygon with ten sides is a decagon, and 10 is a decagonal number. But it is also a triangular number and a centered triangular number. Ten is the number of n-Queens Problem solutions for n = 5.
If you plan on attending, please include in your posting how many will be in your group. Be sure to watch this page for updates, changes, picture of the coins and/or announcements.
Remember if you miss this event you will have to wait a hundred years for the next 10-10-10!
A GCCO Gold coins and other prizes will be given out as door prizes. I will also be selling a limited edition 10-10-10 coin.