• Index
• Keywords
• Home
• Random
• Glossary
• The book!

• Previous
• Next
• Random

• Mail Editor
• Submit Curio
• Prime Puzzio
• Test Number

The Boeing 757 has the lowest operating cost per seat-mile of any single-aisle jetliner in its class and a lower cost per trip than any twin-aisle airplane.

The smallest palindromic prime that remains prime when its leading digit is replaced by any nonzero digit that is a power of two. [Russo]

The largest of three 3-digit palindromic primes that are not the sum of consecutive composite numbers. The other two are 313 and 383. [Loungrides]