Problems(1)
The first four terms of an infinite sequence S of decimal digits are 1, 9, 8, 2, and succeeding terms are given by the final digit in the sum of the four immediately preceding terms. Thus S begins 1, 9, 8, 2, 0, 9, 9, 0, 8, 6, 3, 7, 4, ⋯. Do the digits 3, 0, 4, 4 ever come up consecutively in S? Recursive Sequences