gen_seq

import random
def gen_seq():
    a, b, c = 0, 0, 0
    while True:
        a = random.randint(1, 100)
        b = random.randint(1, 100)
        c = random.randint(1, 100)
        if a < b and b < c:
            if b-a == c-b:
                return [(a, b, c), b-a]

for _ in range(10):
    print(gen_seq())