Expressed in terms of the family of hyperoperations formula_5, the function "f" is the particular sequence formula_6, which is a version of the rapidly growing Ackermann function "A"("n","n").
Expressed in terms of the family of hyperoperations formula_11, the function "f" is the particular sequence formula_12, which is a version of the rapidly growing Ackermann function "A"("n","n").