We just completed a major update. Let us know if anything is not working.

# 99999...99999 (53-digits)

This number is a prime.

999 9999999999 9999999999 9998999999 9999999999 9999999999

Single Curio View: (Seek other curios for this number)

The first absolute largest palindromic prime. Absolute
largest, i.e., formed from 9's and the middle digit 8, and,
so, larger than any palindrome with the same number of
digits. Palindromes of this pattern are expressed by the
form 10^(2k+1)-10^k-1. [Silva]
Submitted: 2009-08-03 05:05:40; Last Modified: 2009-08-04 11:30:17.

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell