Does r=uint64(308436464205151562) make sense? It seems like the argument to uint64 is a double precision number, so you have already lost the precision you are trying to gain by using uint64.
r=uint64(308436464205151562) outputs for uint64(r) 308436464205151562. However, r=308436464205151562 outputs for uint64(r) 308436464205151552. A very small loss in precision, but still a loss. The Challenge set has some numbers that use all the paint if full precision math was used. If residual paint was required as an output then full precision is needed. For solutions using p=p-2*r-1 the errors in r and p may cause issues.
Very novel input parameter adjustment to allow direct solution.
That's Muller's method which is more computationally realiable than Bhaskaracharya's.
Nice bisecting search method and anonymous function for clean appearance.
Find the peak 3n+1 sequence value
Project Euler: Problem 5, Smallest multiple
Back to basics 8 - Matrix Diagonals
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Set a diagonal
Cody Matlab Version
Coin Tossing: Probability of Same Heads for N tosses
Kurchan Square - Evaluation Function
Mastermind III: Solve in 1
GJam March 2016 IOW: Password Single
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