print('2.1')
series = [i for i in range(1,16) if (i%2 != 0) & (i%3 != 0)]
print(series)
print('2.2')
mn = 1
mx = 100
suma = 100
while mn<=mx:
    suma = mn + suma
    mn = mn + 1
print(suma)
print('2.3')
for i in range(1,11):
    for j in range(1,11):
        print("%i X %i = %i"%(i,j,i*j))
print('2.4')
b = 0
for i in range (1,101):
    b += 1/i
print('b_100:',b)