What is the next number - 71, 79, 67, 80, 68, ??

Question

What is the next number in the sequence -
1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109, 129, 130, ?

Answer 1

71,79,67,80,68,(76)
71-79, 67-79, 80-67, 68-80, (76-68)
8 -12 13 -12 (8)

Answer is 76

Comments

Can anyone explain me how 76 is the ans