Prime Curios!: 641

641
(another Prime Pages' Curiosity)

Curios:

Index
Keywords
Home
Glossary
The book!
Previous
Next
Random

Curios Search:
Participate:

Mail Editor
Submit Curio
Prime Puzzio
Test Number

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

Replacing each digit d of 641 with d copies of the digit d produces another prime, i.e., 641 becomes 66666644441, which is also prime. If we apply the same transform using 66666644441, yet another prime is formed. [Honaker]

Submitted: 1999-09-22 20:12:53; Last Modified: 2009-03-04 19:01:06.