One abnormality of the stroke selection/path is loss of anti-aliasing when an even number of pixels is used. Since a circle is made up of stepped square pixels and on a large circle the quarter points tend to be 'flat', loss of anti-aliasing makes that part look 'thin'
Use an odd number of pixels or set a brush to the correct size and stroke with the brush tool as an alternative. (bottom of the stroke dialogue)
colours?
You can always dump this web-page as a PDF https://www.rapidtables.com/web/color/RGB_Color.html
I had that named colours as a palette one-time, can't seem to find it at the moment, it will be in my archive somewhere.
I am wrong, it is a standard Gimp palette
Use an odd number of pixels or set a brush to the correct size and stroke with the brush tool as an alternative. (bottom of the stroke dialogue)
colours?
You can always dump this web-page as a PDF https://www.rapidtables.com/web/color/RGB_Color.html
I am wrong, it is a standard Gimp palette