That my idea too. It is very unlikely that the numbers are spread apart enough that you can't store the deltas in compact forms. Example starting your base as

That my idea too. It is very unlikely that the numbers are spread apart enough that you can't store the deltas in compact forms. Example starting your base as zero if the first number 100 you can store that in 1 byte, use the high bit to flag a larger number so if the next number is say 10000 you can store it in two bytes. But let's say the next number is 3000, you need to update the first delta, insert the new number and continue on. You probably can store most numbers that way.