In column A, I have a collection of sequential data.They all start from 1, but end with different numbers. I wish I can create a column B, which has the max number for each sequence. Is there any formula can help me do this? These numbers are in different cells.eg.A1=1 A2=2 A3=3.....
A 123123412
B 333444422
If the numbers aren't in the same cell and the sequences always start with 1 you can just look for the next 1 in the column and go back 1 (except for the last sequence where you need to find the last number in the column):
=IFERROR(INDEX(A$1:A$100,MATCH(1,A2:A$100,0)+ROW()-1),LOOKUP(999,A$1:A$100))
This is shorter but has to be entered as an array formula using Ctrl-Shift-Enter (CSE):
=INDEX(A1:A$99,MATCH(TRUE,A2:A$100<A1:A$99,0))
Non-CSE version
=INDEX(A1:A$99,MATCH(TRUE,INDEX(A2:A$100<A1:A$99,0),0))