do  -- list the first 30 numbers that are squares but not cubes
    -- also indicate the numbers that are both squares and cubes

    local maxCount <const> = 30
    local count, c, c3, s, sq = 0, 1, 1, 0

    while count < maxCount do
        s += 1
        sq = s * s
        while c3 < sq do
            c += 1
            c3 = c * c * c
        end
        io.write( string.format( "%5d", sq ) )
        if c3 == sq then
            io.write( $" is also the cube of {c}" )
        else
            count += 1
        end
        io.write( "\n" )
    end
end