111121
This number is a prime.
A prime formed from the first three terms of the geometric progression (1, 11, 121) whose common ratio is the smallest double-digit prime. [Bhattacharya]
The smallest prime formed from the first consecutive rows of Pascal's triangle: 1 11 121. [Silva]
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell