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added 4 characters in body

edited Oct 22, 2016 at 1:13

J, 55 4 bytes

^/ .#@#

This is literally the definition of tetration.

 f =: ^/ .#@# 3 f 2 16 2 f 1 1 2 f 2 4 2 f 5 3125 4 f 2 65536

^/ .#@# Input: b (LHS), a (RHS)   # Make b copies of a ^/ .@ Reduce from right-to-left using exponentation

^/ .#

This is literally the definition of tetration.

 f =: ^/ .# 3 f 2 16 2 f 1 1 2 f 2 4 2 f 5 3125 4 f 2 65536

^/ .# Input: b (LHS), a (RHS)   # Make b copies of a ^/ . Reduce from right-to-left using exponentation

^/@#

This is literally the definition of tetration.

 f =: ^/@# 3 f 2 16 2 f 1 1 2 f 2 4 2 f 5 3125 4 f 2 65536

^/@# Input: b (LHS), a (RHS) # Make b copies of a ^/@ Reduce from right-to-left using exponentation

answered Oct 22, 2016 at 1:01

^/ .#

This is literally the definition of tetration.

 f =: ^/ .# 3 f 2 16 2 f 1 1 2 f 2 4 2 f 5 3125 4 f 2 65536

^/ .# Input: b (LHS), a (RHS) # Make b copies of a ^/ . Reduce from right-to-left using exponentation