25a + 5b + c = 49c + 7b + a,1 ≦ a ≦ 4, 0 ≦ b ≦ 4, 0 ≦ c ≦ 4 https://www.wolframalpha.com/input?i=25a+%2B+5b+%2B+c+%3D+49c+%2B+7b+%2B+a%2C1+%E2%89%A6+a+%E2%89%A6+4%2C+0+%E2%89%A6+b+%E2%89%A6+4%2C+0+%E2%89%A6+c+%E2%89%A6+4&lang=ja 201_5,402_5 https://ja.wolframalpha.com/input?i=201_5%2C402_5
25a + 5b + c = 49c + 7b + a,1 ≦ a ≦ 4, 0 ≦ b ≦ 4, 0 ≦ c ≦ 4
https://www.wolframalpha.com/input?i=25a+%2B+5b+%2B+c+%3D+49c+%2B+7b+%2B+a%2C1+%E2%89%A6+a+%E2%89%A6+4%2C+0+%E2%89%A6+b+%E2%89%A6+4%2C+0+%E2%89%A6+c+%E2%89%A6+4&lang=ja
201_5,402_5
https://ja.wolframalpha.com/input?i=201_5%2C402_5