Chimps can remember a sequence of numbers for longer than many humans. Humans can also have trouble remembering, when the numbers are only seen for a short time, where a chimp just has to see the numbers.
The test Chimp Ayuma, could remember the order of five numbers that were flashed for 210 milliseconds

hehe awesome!

Think chimps responding to shapes and patterns (gestalts) whereas humans tend to pass numbers through higher cortical centres as numbers are abstract but important cultural symbols. Plus most of us have an emotional fear of numbers which would inhibit responses.To some extent the price we pay for cortical development and abstract, discursive thinking is to over-ride our basic thinking skills, perceptual abilities, memory etc (which is why young children not yet skilled in that way of being are better at some things than grown ups),

I saw them on TV this morning. Amazing.