Western Europe and North America
Seven has accumulated more good will than any other number in the West — the days of creation, the days of the week, the most likely total on a pair of dice, and a permanent home on slot-machine reels.
Smorfia napoletana'O vasothe vase
Cultural interest — does not change your odds.
What the machines actually did with 7, across every lottery this site holds a long record for.
Across 5 lotteries that hold a 7, its average deviation from expectation is −0.42σ. Statistically ordinary, everywhere.
The one thing a belief about a number can measurably do is change how many people play it — and a jackpot shared more ways is worth less to each winner. That is the only real consequence, and it is arithmetic rather than folklore.