I need to select the registers that ends with 1

Example:

Select number from Table where MOD(number, 10) = 1

Supose I have an index for number's column.

When I use the MOD function the database does not use the index so I changed to

SELECT number from table where (number - (number/10) * 10) = 1

That is the MOD formula.

For the same reason the database does not use the index.

I looked on net and found that on Db2 ZOS is possible to use index based on functions.

Is this possible to DB2 9.7 Linux?

Thanks