# 17717171

This number is a prime.

Formed from 17 followed by its reversal repeated three times. Repeating the reversal before 17, we obtain another prime: 71717117. Taking the reversal of 17 and and using the same process, two new primes are yielded: 71171717, 17171771. Note that the reversal must be repeated at least three times with a number to give prime. [Silva]

(There is one curio for this number that has not yet been approved by an editor.)

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