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