• 올인원 · 1117418 · 2시간 전 · MS 2021

    (a, b, c)
    = (1, 3, 1)
    = (2, 9, 7)
    = (4, 9, 5)
    = (6, 9, 3)
    = (8, 9, 1)
    = (6, 27, 18)
    = (12, 27, 9)
    = (4, 81, 79)
    = (8, 81, 77)
    ...

    a[3] = 22
    a[6] = 57
    a[9] = 174

    a[3] + a[6] + a[9] = 253