A sequence of six consecutive nines occurs in the decimal representation of the number pi, starting at the 762nd decimal place. Wikipedia

Sequence of digits in the math constant π, incorrectly attributed to Feynman Wikidata

The position (at the 762nd digit after the decimal point) in the decimal expansion of pi at which a sequence of six consecutive nines first appears, unexpectedly early in view of the expected and otherwise apparent randomness of said expansion. Wiktionary