For the epact we have
((N + 10(N - 1)) / 30)_r = ((17 + 160) / 30)_r = (177 / 30)_r = 27;
likewise c - 16 = 18 - 16 = 2, (c - 15) / 3 = 1, a = 0; therefore
Encyclopaedia Britannica, 11th Edition, "Bulgaria" to "Calgary" Volume 4, Part 4 · 第 56 / 71 题