I notice that p=isprime(x) can be a lot slower than p=ismember(x,primes(max(x))); for x=1:1e7, the former takes about 100 seconds and the latter takes about 0.1 seconds.
Nice observation. I'll keep that one in mind.
length of string on cylinder
Numbers spiral diagonals (Part 2)
Approximation of Pi (vector inputs)
Matrix of almost all zeros, except for main diagonal
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Test the generalized Legendre conjecture
Iterate the sum of divisors and totient
Count trailing zeros in a primorial
Compute expulsions from the Kimberling shuffle
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