Prime Curios!: 647

647
(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

The smallest prime that may be written as 2a² - 1, and also as 3b³ - 1. [Hartley]

A man described as looking like a plump Moses asked the following questions during a 1987 joint American Mathematical Society/Mathematical Association of America conference in San Antonio, Texas: "What about 647? Is it prime?" (from The Man Who Loved Only Numbers by Paul Hoffman)

To link to this page use http://primes.utm.edu/curios/page.php?number_id=2729