
Hint: it's a cube of a cube
of a prime.
The Big Bang Theory Season 12, Episode 23

I'll give you a HINT.
The Big Bang Theory Season 1, Episode 6

Do I detect a HINT of condescension?
The Big Bang Theory Season 4, Episode 3

I'll give you a HINT,
The Big Bang Theory Season 10, Episode 5

Uh, helpful HINT--
trim your nails first.
The Big Bang Theory Season 5, Episode 17