4429978144299823
This number is a prime.
442997 8144299823
The smallest prime in the smallest set of six primes
{4429978144299823, 4429978144299859, 4429982344299781,
4429982344299859, 4429985944299781, 4429985944299823}
obtained by concatenating any two at a time, from the same
three consecutive 8-digit primes: {44299781, 44299823,
44299859}. [Bajpai]
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