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This number is a prime.
The smallest strobogrammatic prime formed from the concatenation of a pair of 8-digit invertible primes, i.e., (16166681, 18999191). There is another one 16-digit such prime. Can you find it? [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell