The AutoNumber field is designed to always produce a unique value as a record identifier. This is the only thing that the AutoNumber should be used for. This field should actually never be even diaplayed to end users.
When used as it should be used, there is no need to have the numbering start a 1.
Keep in mind that as you use your database and delete records, the Numbers in the AutoNumber field will never be reused and therefore numbers will be missing.
If you need an incrementing sequence number for some purpose the you should use some other method for that.