**Christian Goldbach (1690-1764)**stated that every odd composite number can be written as a sum of a prime and twice a square.

Some examples:

**9 = 7 + 2*1**

21 = 3 + 2*3

25 = 7 + 2*3

33 = 31 +2*1

^{2}21 = 3 + 2*3

^{2}25 = 7 + 2*3

^{2}33 = 31 +2*1

^{2}Now we know that his conjecture is false.

What is the smallest odd composite number not complying with C.G.'s conjecture?