Finding where an item occurs in a list

[knpaddac]

I have a list of values. These particular values are numbered 1 to 90 (in A2:A91). The values in column B (B2:B91) are 1 to 45 with each occurring twice.

I want to setup formulas on a different location on the sheet so that I can have a list of the where each occurrence of the values occurs in the list... For example, if I were looking for the second occurrence of value 27 in column B a formula that would return number 55 from column A....assuming that that is the corresponding location related to that value.
Make sense? Is it possible?

 

[Fluff]

How about

Book1
	A	B	C	D	E	F	G	H	I
1							Find	Occurance
2	1	1					3	2	11
3	2	2
4	3	3
5	4	4
6	5	5
7	6	6
8	7	7
9	8	8
10	9	1
11	10	2
12	11	3
13	12	4
14	13	5
15	14	6
16	15	7
17	16	8
18	17	10
19	18	9
20	19	7
21	20	10
22	21	9
23	22	7
24	23	11
25	24	11
Request

Cell Formulas
Range	Formula
I2	=INDEX(A2:A25,AGGREGATE(15,6,(ROW(A2:A25)-ROW(A2)+1)/(B2:B25=G2),H2))