20897
This number is a prime.
The sum of all odd numbers up to the prime number 20897 is strobogrammatic. (The only known case.) [Sariyar]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The sum of all odd numbers up to the prime number 20897 is strobogrammatic. (The only known case.) [Sariyar]