207
Pb 207 or Lead 207 is the stable end product of the Uranium 235 (or U-235) decay chain.
208 = 3^3 * 2^3
          209
          (20 + 9) + (20*9) = 209
Also, 209 is the product of two 2-digit primes:
          11 * 19 = 209
210
210 is the 20th pyramid number.
Therefore 1 + 2 + 3 + 4 + 5 + 6 +7 +8 + 9 + 10 + 11+ 12 + 13 + 14 + 15 + 16 +17 +18 + 19 + 20 = 210
Two days from today will be the 211th day of the year.
212° F, the temperature at which water boils at sea level.
213 = 312 for my dyslexic friends.
214
Only Factors are 1, 2, 107, and 214? Correct me if I missed any.
Hey wolfmeister, thanks for getting this thread going, and do you have a source for all this info. or are you doing all the calculations yourself. Also, I always use the term triangular numbers rather than pyramid numbers. Do you know about other polygonal (figurate) numbers?
2-15
is the day from hell, if you didn’t get your wife flowers or something!
216 two cubed x three cubed
217
The first two houses I lived in were 217 Ridge Ave. Then 217 Cleveland Ave.
          218
This is the product of 2 primes
          218 = 2 *109
and moejuck thank you. I really like this thread. I think we both helped keep this “alive”.
As far as my source, I just play around on an Excel™ spreadsheet trying to get interesting combinations for numbers. For example, that 209 posting was just a matter of luck.
219- The number of pounds I’d weigh while carrying a 70 pound weight 
219
        21*9 = 189
        21+9 =   30
                    219
Okay, moejuck I think triangular numbers is a better term.
I have heard of pentagonal numbers. Such a number would be a triangular number summed with its corresponding square number. For example the fourth pentagonal number = 10 + 16 = 26.
Sorry for the double posting.
$2.20
$2.08 + tax in PA
Doh! $2.07 + tax… :smack:
221-B Bakerstreet. The address of Sherlock Holmes.
Room 222
According to CNN, the Bushmaster 223 is an accurate, yet inexpensive weapon.
http://www.cnn.com/2002/US/South/10/24/sniper.bushmaster.rifle/
The threads about submissives have got me thinking. Do you suppose our president would respond well to some training using a bushmaster?