19091918181818181919091
This number is a prime.
190 9191818181 8181919091
The first multidigit palindromic prime p such that 2p+1 & 4p+3 are palindromic primes. [Marcel]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean
This number is a prime.
190 9191818181 8181919091
The first multidigit palindromic prime p such that 2p+1 & 4p+3 are palindromic primes. [Marcel]