reflectable prime
(another Prime Pages' Glossary entries)
The Prime Glossary
Glossary: Prime Pages: Top 5000:
GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

A reflectable prime is a prime which is invariant upon mirror reflection along the line its digits are written on. It must contain only the digits 0, 1, 3, or 8. E.g., 181031.

Chris K. Caldwell © 1999-2019 (all rights reserved)