-2.307505293750382035...

This number is neither prime nor composite.

                                      -2.30 7505293750 3820352904 7003240495
1444419884 3286681508 8929361530 2696819695 7956839233 2144527161 5114644...

Just showing those entries submitted by 'Hartley': (Click here to show all)

The only nonzero real solution to x^2/2! + x^3/3! + x^5/5! + x^7/7! + x^11/11! + ... = 0. [Hartley]