Okla. Stat. tit. 58 § 553
Every account for the final settlement and petition for distribution of an estate shall stand for hearing at a date to be fixed by the court, not less than twenty (20) days after the filing thereof; and notice of such hearing shall be given by mailing written or printed copies of the notice of such hearing to the heirs, legatees and devisees whose addresses are known, and deposited in the post office with the postage thereon prepaid, at least ten (10) days before the hearing, and said notice of such hearing shall also be given by publication once each week for two (2) consecutive weeks in a newspaper published in the county, showing the name of the decedent and of the executor or administrator, the date of the hearing, and that such account is for final settlement and distribution: Provided, any number of accounts may be included in one notice and the cost of publication thereof divided among the estates whose settlements are advertised therein.
Okla. Stat. tit. 58, § 553