Both entertaining and informative, A Number for Your Thoughts: Facts and Speculations about Numbers from Euclid to the Latest Computers contains a collection of the most interesting facts and speculations about numbers from the time of Euclid to the most recent computer research.

1. Counting -- 2. The Search for Prime Numbers -- 3. The World Record Holders -- 4. The Distribution of Primes -- 5. Prime Races, Emirps, and More -- 6. The Baffling Law of Benford -- 7. What is so Special about 6174? -- 8. Number Patterns and Symmetries -- 9. Numbers Perfect, Friendly, and Weird -- 10. How do These Series End? -- 11. Fermat's Legendary Last Theorem -- 12. Shapely Numbers and Mr. Waring -- 13. Magic Squares and Cubes -- 14. How can Anything so Simple be so Difficult? -- 15. Nearly All Numbers are Insane -- 16. Cyclic Numbers and their Secret -- 17. Pi, a Transcendental Number -- 18. Most Numbers are Normal, but it's Tough to Find One -- 19. A Different Way of Counting; Geometric Numbers -- 20. Two Dimensional Numbers -- 21. Counting the Infinite -- 22. Update (September 1985) -- Appendices -- Bibliography -- Index.