509 is the 72nd prime with 3 digits........there are 71 primes on either side of it......with 3 digits........72.......like in the periodic table.....in finance.........rule of 72............to see how many years it takes something to double......2 is all over this..........both the 1st prime and the 1st even number......all even numbers.....are so b/c of 2........509.....the median prime....of the 143 primes in 3 digits.......5 + 0 + 9 = 14.........like 14i?