0 votes 0 votes A integer is said to be a $\textbf{palindrome}$ if it reads the same forward or backward. For example, the integer $14541$ is a $5$-digit palindrome and $12345$ is not a palindrome. How many $8$-digit palindromes are prime? $0$ $1$ $11$ $19$ Combinatory isi2016-mmamma combinatory + – go_editor asked Sep 13, 2018 • recategorized Nov 19, 2019 by Lakshman Bhaiya go_editor 382 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes 0 is the answer as any palindrome with even digits will be divisible by 11 and therefore would not be prime. https://en.wikipedia.org/wiki/Palindromic_prime Falahamin answered Mar 18, 2020 Falahamin comment Share Follow See all 0 reply Please log in or register to add a comment.