明解Ｃ言語 入門編 > 5. 配列 > 素数を求める (ver.5) Ruby prime = [] counter = 0 prime[0] = 2 prime[1] = 3 ptr = 2 no = 5 while (no <= 30) j = 0 i = 1 loop do counter += 1 break if (prime[i] * prime[i] > no) counter += 1 if (no % prime[i] ==…