81, 52201, 61231, 63601, 67651, 70141, 70981, 84181, 92641, 100501, 104551, 107641, 116101, 126001 (primes in )
中心正方形质数.每一个质数皆符合 formula_4的数式表达。5, 13, 41, 61, 113, 181, 313, 421, 613, 761, 1013, 1201, 1301, 1741, 1861, 2113, 2381, 2521, 3121