565
This number is a composite.
565 is the least palindrome n such that 10*n+1, 10*n+3, 10*n+7, 10*n+9 are all primes. [Das]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a composite.
565 is the least palindrome n such that 10*n+1, 10*n+3, 10*n+7, 10*n+9 are all primes. [Das]