Tetranacci Constant

The tetranacci constant is ratio to which adjacent tetranacci numbers tend, and is given by

			(1)
			(2)

(OEIS A086088), where  denotes a polynomial root.

The tetranacci constant satisfies the identity

(3)

REFERENCES:

Sloane, N. J. A. Sequence A086088 in "The On-Line Encyclopedia of Integer Sequences."

Waddill, M. E. "The Tetranacci Sequence and Generalizations." Fib. Quart. 30, 9-20, 1992.

Waddill, M. E. "Some Properties of the Tetranacci Sequence Modulo ." Fib. Quart. 30, 232-238, 1992.