Having been duly chastened by my betters (and apparently those of Dirac, Eddington and Feynman) at physics stackexchange, I’ll not bother them with a refinement of something Dirac noticed.
But first, you have to notice this:
If you take the reduced compton wavelength of the electron and put it through a mere 360 degrees shift, you’ll invert its spin (say, from 1 to -1) due to the electron’s spin being 1/2. If, however you take it all the way through 720 degrees spin, you’ll get back to its spin state (say, from 1 through -1 and back to 1). By “reduced” is meant the wavelength is divided by 2pi radians (360 degrees), so that if one multiplies it by 2, you get the equivalent of 720 degrees which brings you through a complete cycle.
So, now, here’s the thing Dirac didn’t notice:
The 5th Catalan Mersenne prime (2^127-1) times the complete cycle of the electron is equal to the light-age of the universe to within 1%:
