Special properties of number 7 (Today’s Date)

1. 7 is a Prime Number.
2. 7 is a palindromic number in decimal system. Also 7 is a palindromic number in binary system (111).
3. 7 is a Mersenne Number (number of the form 2^n -1)
4. 7 is an Octahedral Number.
5. 7 is a Lucas Number.
6. Sum of the first 4 Fibonacci numbers= 1 + 1 + 2 + 3 = 7
7. 7 is the smallest number of sides of a regular polygon that is not constructible by straightedge and compass.
8. Topologists have been able to prove that 7 colors may be needed on a donut shaped map to ensure that no adjacent areas are the same.
9. The smallest positive integer whose reciprocal has a pattern of more than one repeating digit: 1/7 = 0.142857142857...
10. The opposite sides of a die cube always add up to 7.
11. A square piece of paper cannot be folded in half more than 7 times... However, Britney Gallivan (of Pomona, California) found a formula that tells us to successfully fold paper 12 times, we would need about 1.2 km of paper... and she proved it!
12. The 7 colors of the rainbow.
13. There are 7 days in creation, 7 days in the week, 7 phases of the moon etc
14. The 7 wonders of the ancient world are:
- Great Pyramid of Giza,
- Hanging Gardens of Babylon,
- Temple of Artemis at Ephesus,
- Statue of Zeus at Olympia,
- Mausoleum of Maussollos at Halicarnassus,
- Colossus of Rhodes,
- Lighthouse of Alexandria.
15. Adolf Hitler was reputed to take his coffee or tea with seven teaspoons of sugar.
16. Nitrogen is a chemical element with atomic number 7.