Corruption scan cannot get to the matching file#, why?

Question

We have a database that detected with some corruptions. I made a scan from RMAN backup validate check logical database; Checked the the column FILE# in table v$database_block_corruption;
SQL> select file#, count(*) from v$database_block_corruption group by file# order by 1;
FILE# COUNT(*)
1 1
2 1
5 6
10 63
11 196
12 261
13 14
14 69
However, with my listing of the file# from v$datafile, I do not have some files with number like 10,11,12,13.
select file#, name from v$datafile order by 1;
FILE# NAME
1 /u01/cntux/data/system01.dbf
2 /u01/cntux/data/undotbs01.dbf
3 /u01/cntux/data/sysaux01.dbf
4 /u01/cntux/data/users01.dbf
5 /u01/cntux/data/hubprod_data.dbf
6 /content_data/cntux/data/hublobprod_ts.dbf
7 /content_data/cntux/data/hublob.dbf
8 /u01/cntux/data/uccnet_ts01.dbf
9 /u01/cntux/data/tools01.dbf
17 /u01/cntux/data/hubprod_index.dbf
Why? And how can I get these files?
Thanks for advice,

Answer 1

Got answer for it. That is because there data files were used and beign dropped. The issue is fixed in 11g.