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The number 7 is considered lucky in many cultures, and may have to do with the fact that in ancient times there were 7 visible planets in the night sky.
7 also has many mathematical and mythological significances.

en.wikipedia.org/wiki/7

7 is the natural number following 6 and preceding 8. Contents. [hide]. 1 Mathematics. 1.1 Basic .... Masters, a cycle of medieval stories; Seven Wonders of the ancient world; 7 was considered a God number in ancient Egypt. ..... Lucky 7: Short-lived ABC TV series (premiered 2013) about seven people who win the lottery.

en.wikipedia.org/wiki/Chinese_Numerology

In Chinese tradition, certain numbers are believed by some to be auspicious ( 吉利, pinyin: jílì; Cantonese Yale: gātleih) or inauspicious (不利, pinyin: bùlì; Cantonese Yale: bātleih) based on the Chinese word that the number sounds similar to. The numbers 6, 8 and 9 are generally considered to be auspicious, while 4 and 7 .... even being assigned a number with several eights is considered very lucky.

www.dailymail.co.uk/news/article-2601281/Why-lucky-7-really-magic-number.html

Apr 10, 2014 ... Lucky: Seven is seen as the world's favourite number - and it appears across .... But in Italy, 13 is considered a lucky number, especially when ...

psychiclibrary.com/beyondBooks/lucky-number-7

Oct 5, 2013 ... The ancient Greeks thought the number seven to be extremely lucky. Pythagoreans considered the number seven to be a perfect number.

www.quora.com/Why-is-the-number-7-considered-as-a-lucky-number

It is not lucky only special; (from my book Numerology Workbook). "The 3 (spirit, mind, and soul) descend into the 4 (the world), the sum being the 7, or the mystic  ...

www.travelchinaguide.com/intro/lucky-number7.htm

People with the lucky number 7 usually like to explore the causes of the matters. ... This combination is considered as “harmony” in the ideology of Confucianism.

theconversation.com/why-7-is-the-luckiest-number-55960

Mar 8, 2016 ... But it was Manchester United that made the number seven shirt iconic ... 7 for a variety of reasons and not just because it was considered lucky.

www.psychologytoday.com/blog/fulfillment-any-age/201109/7-reasons-we-7-reasons

Sep 20, 2011 ... 7 is lucky. The prototypical lucky number, 7 is a heavy hitter in the gambling world . Slot machines often offer three 7's as the big payout.

www.express.co.uk/news/uk/469565/The-magnificient-7-The-meaning-and-history-behind-the-world-s-favourite-number

Apr 10, 2014 ... He also says that they chose seven as Harper's middle name “because it symbolises spiritual perfection and is regarded as a lucky number in ...