The word "between" implies two values. There cannot be anything between a single item.
71 is a single number and so there is no "between" possible!
71 is prime.
It is: 71
61 67 71
(59 + 71) / 2 = 65
Halfway between them is 69.
76 !
72.
The difference between 7 times the last digit and the rest of the number is a multiple of 71
67 or 71
2OO
67 71 73