59

This number is a prime.

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59 divides 616161... 61 (repeated 29*n times, n integer), but 61 divides 595959... 59 (repeated 30*n times, n integer). Note that 29 and 30 are consecutive numbers and also that 59 and 61 are consecutive primes. [Capelle]

The number of right-truncatable primes containing at least a digit 9. Note that 59 is a right-truncatable prime containing a digit 9. [Capelle]