Additive primes: Difference between revisions
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# Uses P3 Prime Generator (PG) and its Prime Generator Sequence (PGS). |
# Uses P3 Prime Generator (PG) and its Prime Generator Sequence (PGS). |
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def prime?(n) # |
def prime?(n) # P3 Prime Generator primality test |
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return false unless n > 1 && 6.gcd(n % 6) == 1 || [2, 3].includes?(n) |
return false unless n > 1 && 6.gcd(n % 6) == 1 || [2, 3].includes?(n) |
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sqrt_n = Math.isqrt(n) # For Crystal < 1.2.0 use Math.sqrt(n).to_i |
sqrt_n = Math.isqrt(n) # For Crystal < 1.2.0 use Math.sqrt(n).to_i |
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