When you divide 1 by 7 you get a strange unknown number 0.14285714......
if you divide 1 by any other number the result is simple but not with the Number 7

also 7 is a very special number in all religions (7 heavens, 7 lives, a week is 7 days, universe created in 7 days .......)

7 is the number of completion and perfection. All birds eggs hatch by the number 7 times a certian amount of days. Snake eggs hatch every 49 days which is 7 X 7 = 49. There are 7 continents. Saturn is the seventh planet that revolves around the sun. There are 7 days in the weekly cycle. The 7th day of the weekly cycle in mentioned twice in the fourth commandment found in Exodus 20:8-11 and is called the Sabbath of the Lord. The Lords day is saturday the 7th day of the weekly cycle. 7 is special because God Rested, Blessed and Sanctified the 7th day of the weekly cycle, according to Genesis 2:1-3. The only place you can find a weekly cycle is in the Bible. No other holy book of any religion introduces the weekly cycle with 7 days in it.

The reason that the Christian world sees 7 as a lucky number is due to the many references to a 7 day week, with the 7th day being the Lord's day.

9 is the lucky number is many parts of Asia, so it is nothing in particular to do with the number itself.

Viper started on a fun sequence. Divide 7 into the number one through 6 and watch the pattern. Each one repeats 6 digits, and each time it is the same 6
1/7 = .142857
2/7 = .285714
and so on.

7 means happieness, also the earth is divided to 7 continents and we all know the 7 wonders in world.