Euler #44

penta = []
for a in range(1, 10**10):
    print(a)
    value = int(a*(3*a-1)/2)
    penta.append(value)
    for b in penta:
        if (value - b) in penta:
            index = penta.index(value) + 1
            for c in range(1, 10**10):
                check = index + c
                if int(check*(3*check-1)/2) == (value + b):
                    print(value - b)
                    quit()
                elif int(check*(3*check-1)/2) > (value + b):
                    break