n-th operation. The successor function outputs a natural number that is one greater than the input (n=1). Addition is repeated use of the successor function (n=2). Multiplication is repeated addition (n=3). Exponentiation is repeated multiplication (n=4). Towers of powers are repeated exponentiation (n=5). ??? are repeated towers of powers (n=6)? ??? are repeated ??? (n=7)?
The number of atoms in the universe is estimated to be 10^80 atoms. The required computation would involve just the level of exponentiation. So it boggles the mind how the numbers involved get so big so fast.
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