Problems solved: 40
Rank by points: #1088
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___________GCD(X,Y) = GCD(X,Y - X)___________
X is fibonacci if 5x^2-4 and 5x^2+4 is square
X is prime if 2^(x-1)%x == 1 except 2
Xor from 1 to n
- n%4 == 0 return n
- n%4 == 1 return 1
- n%4 == 2 return n+1
- n%4 == 3 return 0
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