73535...35353 (68-digits)
This number is a prime.
73535353 5353535353 5353535353 5353535353 5353535353 5353535353 5353535353
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]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell