The houses at Skara Brae were designed with entry communal passages under 4' tall. I don't believe this was to solve any esoteric math encryption.

There is some discussion whether this was a form of honor to the owner by approaching at a lower crouch or defense.

I could imagine the Pharaoh being asked;
"Should the access to your tomb be tall enough to walk upright? Or lower that they must crouch?"

Response; "Make it that they must crawl".

Also, it occurs to me stocking the tomb with the grave goods could be as easy as a small sledge with two ropes being drawn up and down the passage by two gangs.

Jammer