90010...00007 (46-digits)

This number is a prime.

                          900100 0021200032 0011004832 3779319397 8070200007

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

A center-deletable prime. In other words, delete the center two digits and this new number is also prime. Repeat this process until only two digits remain. [Patterson]