B2. How many positive integers $a$ are there, for which it is true that: when you divide 2216 by $a$, the remainder is 29.
B2. 4 Dat 2216 bij deling door $a$ rest 29 geeft, betekent precies dat $2216-29=2187$ deelbaar is door $a$ en dat $a$ groter is dan 29 (de rest is altijd kleiner dan de deler $a$). The divisors of $2187=3^{7}$ that are greater than 29 are 81, 243, 729, and 2187. There are thus 4 possibilities in total.