12491...11753 (216-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

                                                                      124914
9041047939 8338397337 3763953353 9437437331 3371331311 3703392382 1827721729
6236275215 2142932332 9227223221 1299179139 1191181971 3717613617 5115194193
1731131721 3119017013 0110179983 8973717761 6953574341 4731392329 1713111753

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

The concatenation of the digit reversal of the first eighty-one odd primes in reverse order is prime. [Antonious]