112111211
This number is a prime.
Were 1 still regarded as prime, this palindromic prime would be the 11th to have a multi-digit palindrome as index, with the sum of its own digits as 11 and the sum of the index's digits as 11th prime: p6417145=112111211. [Merickel]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell