Let x0,x1,x2,… be a sequence of numbers, where each xk is either 0 or 1. For each positive integer n, define
Sn=∑k=0n−1xk2k
Suppose 11Sn≡1(mod2n) for all n≥1. What is the value of the sum
x2019+2x2020+4x2021+8x2022?
2
4
6
8
10