73535...35353 (68-digits)

This number is a prime.

  73535353 5353535353 5353535353 5353535353 5353535353 5353535353 5353535353

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A prime number such that all its digits are prime and every pair of consecutive digits is a prime. It is the only prime less than a googol formed by concatenation of two prime-digit primes 73 and 53. [Bajpai]