№21 — #213

def f(a, b, m):
    if a + b >= 207: return m % 2 == 0
    if m == 0: return 0
    h = [f(a + 1, b, m - 1), f(a, b + 1, m - 1), f(a * 2, b, m - 1), f(a, b * 2, m - 1)]
    return any(h) if m % 2 != 0 else all(h)
# print('19)', [s for s in range(2, 189) if not f(17, s, 1) and f(17, s, 2)])
# print('20)', [s for s in range(2, 189) if not f(17, s, 1) and f(17, s, 3)])
print('21)', [s for s in range(2, 189) if f(17, s, 4) and not f(17, s, 2)])