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N-smooth numbers: Difference between revisions
→{{header|Crystal}}
Line 624:
return false if n.gcd(6) != 1 # 1/3 of integers are P3 pc
pc = typeof(n).new(5) # first P3 prime candidates sequence value
▲ until pc > sqrtN
return false if n % pc == 0 || n % (pc + 2) == 0 # if n is composite
pc += 6 # 1st prime candidate for next residues group
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