The number 7 is lucky in slots and pop culture because it’s tied to positive...

https://ellassmartperspectives.urbanvellum.com/posts/is-seven-always-about-luck-or-can-it-mean-something-else

The number 7 is lucky in slots and pop culture because it’s tied to positive ideas like the seven-day week and good fortune. In classic slot games, hitting 777 often means a big win