9 + 9 = 18.........like pi in the unit circle......half way around........

1828
1828

In e..............8 is the 10th number........8 + 10 = 18.......the two interpretations to 2 ^i.....the square root of 8 and the square root of 10.............approx for e and pi respectively.........a line art 1/2.......a square root is when an exponent is 1/2.....1 + 1/2.....the 1st two terms.....have 3 numbers....when taken separately......1, 1, 2....like the prime fundamental backwards.....2 - 11.......reflex sum.....

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Prime number

A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. Wikipedia