12345...81967 (31-digits)

This number is a prime.

                                          1 2345678910 1112131415 1617181967

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

An easy to remember prime number if you are a HKer and speak Cantonese because of “19” and “67”. All you need to do is write the natural numbers up to 19 and end with 67. [Kelvinella]