19191...19191 (39-digits)

This number is a prime.

191918080 8180919090 9090919081 8080819191

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This palindromic Sophie Germain prime starts a Cunningham chain of three palindromic primes. [Dubner]

Submitted: 1999-09-02 23:40:00; Last Modified: 2008-07-07 16:17:31.

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