Hello. I am jan Li (sorry for miswriting), and maybe I am one of those nasa people. I asked myself:
"Does any a priori number exist?"
I think it would be nice to have names for these two numbers, and I am explaining why.
Seven: the maximum number a human can "visualize" is seven (further numbers are seen divided, e.g. 8 = 4+4). So it is much concrete of a number.
150, that is, Dunbar's number: the to the number of people with whom one can maintain stable social relationships (further info.s: http://en.wikipedia.org/wiki/Dunbar%27s_number). This is another concrete number.
How to name them? I really don't know that. Hope Sonja will read this. Bye