This question already has an answer here:

"...isn't seven the most powerfully magical number, wouldn't seven-?"

Well is it? The list link lacks...magic, most of the events being mundane or even coincidental.

Edit; because the question is fairly trivial without this change: Are there any examples of the number seven being magical in nature? In particular is there any actual magical advantage to having 7 horcruxes, or is it just sentiment?

merged by AncientSwordRage Jul 16 '16 at 19:20

This question was merged with Harry Potter: Why 7? because it is an exact duplicate of that question.

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