It seems as if the difference in the sum for the preceding 1-digit numbers are 1. i.e., you have to add 1 to 1+2+4=7(+1) = 8, then to get to 30 you have to add another 1, (1)+1+2+4+8+15=30. Then, for some reason, the difference becomes 10 to the negative. And seeing as the initial statement said that the next number in the sequence must be less than 150, I assume that there will simply be another digit added, and also to the negative, i.e. the sum of all the numbers minus 100.
I will tell you if its 110 by tomorrow when he answers my email. Oh and big dog It doesnt double 4 more times since 50 is not two times 30. Boerseun how did you get 110 since the method is more important than the answer
You're right - I am by no stretch of the imagination a mathematician.