While going through Josephus Problem I found out this :

The issue highlighted in the screenshot is that the dollar sign ($) in the sidebar's text for "Analytical solution for k = 2 " and "Analytical solution for k>2" is not being interpreted correctly for rendering mathematical notation. Instead of displaying the variables k = 2 and k>2 in a properly formatted mathematical style, they are shown as plain text with the dollar signs visible. This suggests that the webpage's math rendering engin is not processing these dollar-sign-enclosed formulas within the sidebar context. Same for other places as well.