Prime Curios!: 9921

9921
(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)

The largest four-digit composite number ending in 1, 3, 7, or 9 that yields no primes if the first digit is changed. I.e., 1921, 2921, 3921, 4921, 5921, 6921, 7921 and 8921 are all composite numbers

Submitted: 2004-01-01 00:11:44; Last Modified: 2008-01-30 11:28:00.