import time
def prime(g,m,n):
    lst = [2]
    if m%2==0:
        m+=1
    k=0
    for i in range(3, n, 2):
        if not k and lst[-1]>=m:
            k=len(lst)

        if (i > 10) and (i % 10 == 5):
            continue
        for j in lst:
            if j * j - 1 > i:
                lst.append(i)
                break
            if (i % j == 0):
                break
        else:
            lst.append(i)
    for i in range(k,len(lst)-1):
        if lst[i+1]-lst[i]==g:
            return lst[i],lst[i+1]
starttime=time.time()
print(prime(4,1000000,2000000))
print(time.time()-starttime)
#(1000033, 1000037)
#3.7940053939819336