11112...21111 (41-digits)

This number is a prime.

1 1112233444 5566777889 8877766554 4433221111

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A palindromic prime formed from the first digits of all two-digit primes in forward and reverse concatenation. [Silva]

Submitted: 2009-07-30 08:50:20; Last Modified: 2009-07-30 14:22:42.