Dba_advisor_definitions

Hi,
In DBA_advisor_definitions, I can see property value like 15,7,3,31 in my Oracle 10.2.0.1 databases instead of just 0s and 1s.
what does this indicates,please explain?
ADVISOR_ID,ADVISOR_NAME,PROPERTY
1,ADDM,1
2,SQL Access Advisor,15
3,Undo Advisor,1
4,SQL Tuning Advisor,7
5,Segment Advisor,3
6,SQL Workload Manager,0
7,Tune MView,31

Hi,
found out how the values are interpreted.
why you people cant just say that property value is binary code value (set by the 4 bits) converted to decimal number?
ADVISOR_ID,ADVISOR_NAME,PROPERTY
1,ADDM,1 ---------------------------------------------------------> 0001
2,SQL Access Advisor,15 -------------------------------------> 1111
3,Undo Advisor,1 ------------------------------------------------> 0001
4,SQL Tuning Advisor,7 ---------------------------------------> 0111
5,Segment Advisor,3 -------------------------------------------> 0011
6,SQL Workload Manager,0 -----------------------------------> 0000
7,Tune MView,31 ------------------------------------------------> 11111
even then, for tune Mview to get a decimal value of 31 binary value, then it should be 5 ones?
thanks,
DB

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