double[] xs = { 1, 2, 3, 4, 5 };
double[] ys = { 10, 2_000, 50_000, 1_000_000, 1_500_000 };

var plt = new ScottPlot.Plot();

// Plot the log of the Ys
double[] logYs = ys.Select(y => Math.Log10(y)).ToArray();
var scatter = plt.AddScatter(xs, logYs);

// label each point with a red line
plt.Palette = ScottPlot.Palette.ColorblindFriendly;
for (int i = 0; i < scatter.PointCount; i++)
{
    double x = scatter.Xs[i];
    double y = scatter.Ys[i];
    double actualY = Math.Pow(10, y);
    var color = plt.Palette.GetColor(i);
    plt.AddHorizontalLine(y, color, 1, ScottPlot.LineStyle.Dot);
    plt.AddVerticalLine(x, color, 1, ScottPlot.LineStyle.Dot);
    plt.AddPoint(x, y, color, 10, ScottPlot.MarkerShape.openCircle);
    var txt = plt.AddText(actualY.ToString("N0"), x, y, 12, System.Drawing.Color.Black);
}

// Use a custom tick formatter to label tick marks as the antilog of their position
Func<double, string> tickLabeler = (y) => Math.Pow(10, y).ToString("N0");
plt.YAxis.TickLabelFormat(tickLabeler);

// Use log-spaced tick marks and grid lines to make it more convincing
plt.YAxis.MinorGrid(enable: true);
plt.YAxis.MinorLogScale(true);

// Set the axis limits manually to ensure edges terminate at a nice locations in log space
plt.SetAxisLimits(.5, 5.5, 0, Math.Log10(10_000_000));