595039

This number is a prime.

+ Some primes remain prime when reinterpreted as hexadecimal (e.g. 11, 0x11 = 17). If one uses this phenomenon recursively, 595039 is the smallest prime that generates a 7-tuple of multidigit primes: (595039, 0x595039 = 5853241, 0x5853241 = 92615233, 2455851571, 156053607793, 23503459874707, 9939809955432199). [Yosei]

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