Sorry everyone, it has been a long time since my last post here.
So, it is the sum of two sexy primes (http://www.mathisfunforum.com/viewtopic.php?id=19312) and square numbers, and subtracted by the square root.
SP = Sexy prime
SQN = Square number
SQRT = Square root
(SP + SP) + (SQN + SQN) - (SQRT + SQRT)
(5 + 11) + (1 + 4) - (1 + 2)
(16 + 5) - 3
21 - 3
Go, continue the sequence!
I am getting:
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.