significance of sequence of 7's...

is there any mathematical significance of 7's in a string sequence, compared to other numbers?

i see casino's advertise a lot as if four of 7's come together or 5.. why 7? is there any mathematical foundations of 7777 or 77777 and so forth?
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Paul MacDonaldDirector, Information SystemsCommented:
7 is a "lucky" number in some cultures.
And a row of three, four, or five 7's on a slot machine is one of the classic jackpot combinations.
Paul MacDonaldDirector, Information SystemsCommented:
The more, the merrier.

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