A mathematical function of natural numbers in which the welch function is recursively applied to the argument and each solution until a prime number or the number 4 is yielded. For example:
U(12) = U(2 + 2 + 3) = U(7) = 7.
U(14) = U(2 + 7) = U(9) = U(3 + 3) = U(6) = U(2 + 3) = U(5) = 5
U(44) = U(2 + 2 + 11) = U(15) = U(3 + 5) = U(8) = U(2 + 2 + 2) = U(6) = U(2 + 3) = U(5) = 5
U(4) = U(2 + 2) = U(4) = U(2 + 2) = U(4) = ...
I do this in my head
constantly, with
street addresses,
license plate numbers, you name it; every once in a while it starts to freak me out. If you do stuff like this, you probably also have a
math brain.