The PermanentIndices command returns the indices of the permanent entries of the given cache table.  The cache table can be given directly as cache, or cache can refer to a procedure that has, or can have, a cache remember table.  If such a procedure is given and it has a cache remember table, the keys of the permanent indices from that table are returned.  If the procedure does not have a table, NULL is returned.

PermanentIndices returns the indices in the same format as indices, that is, a sequence of lists where the contents of each list is an index of a permanent entry from the table.

The PermanentEntries command can be used to get the indices of the permanent entries.

For more information on cache tables, see Cache Package.

p := proc( x ) option cache; x^2; end proc;