
Curios:
Curios Search:
Participate: 
The smallest palindromic prime greater than 131 formed by alternating 1 and 3. It has a square number of digits (25) and its sum of digits is also a square number (49). [Gallardo] A prime formed by concatenating thirteen 13's and deleting the last digit. [Avrutin]
Prime Curios! © 20002018 (all rights
reserved)
