Integer#prime?

# File tmp/rubies/ruby-3.0.5/lib/prime.rb, line 35
def prime?
  return self >= 2 if self <= 3

  if (bases = miller_rabin_bases)
    return miller_rabin_test(bases)
  end

  return true if self == 5
  return false unless 30.gcd(self) == 1
  (7..Integer.sqrt(self)).step(30) do |p|
    return false if
      self%(p)    == 0 || self%(p+4)  == 0 || self%(p+6)  == 0 || self%(p+10) == 0 ||
      self%(p+12) == 0 || self%(p+16) == 0 || self%(p+22) == 0 || self%(p+24) == 0
  end
  true
end