Look at the sample problems and it will be obvious. For example, look at all the arbitrary constants here: "Let an for n ∈ Z be the sequence of integers satis

Look at the sample problems and it will be obvious. For example, look at all the arbitrary constants here: "Let an for n ∈ Z be the sequence of integers satisfying the recurrence formula1 an = (1.981 × 1011)an−1 + (3.549 × 1011)an−2 − (4.277 × 1011)an−3 + (3.706 × 108 )an−4 with initial conditions ai = i for 0 ≤ i ≤ 3. Find the smallest prime p ≡ 4 mod 7 for which the function Z → Z given by n 7→ an can be extended to a continuous function on Zp."