1 x x2 log2(x) x log2(x) 2x ex
    1 10 100 3.32 33.2 1024 22026
    1 20 400 4.32 43.2 1048576 485165195
    1 30 900 4.91 49.1 1.07374E9 1.06865E13
    1 40 1600 5.32 53.2 1.0995E12 2.35385E17

    The combined figure when x in [0,5] can be downloaded from here: ps | pdf.