1/2(13) = 6.5...............................so many 13's................................two 4.5's...........on either side of 6.5...................to 2 to 11....................two 4.5's...........like two 45 degree angles in a right triangle...............1 for each side................a 1 and a 1......like 11.........the square root of 2......for the hyp.................





4.5 on either side of 6.5............from 2 - 11.......including the end and beg numbers..............two 4.5's...........like a 45/45 right triangle..........................a block..........of numbers in e................459045.........................which starts at the 11th number......................................so much sym....................



2.718281828459045 

e (Euler's Number)

The number e is a famous irrational number, and is one of the most important numbers in mathematics.
The first few digits are:

2.7182818284590452353602874713527 (and more ...)

It is often called Euler's number after Leonhard Euler (pronounced "Oiler").