An Egyptian Army lieutenant and three other men were officially indicted on charges of "premeditated murder" in the assassination of president Anwar Sadat last month.

Twenty other men, including a blind mullah said to be the killers' spiritual guide, were charged in connection with the murder.

All 24 implicated in the assassination of Sadat as he watched a military parade here Oct. 6 are to be brought to trial before a three-man military tribunal Nov. 21.

In announcing the indictments today, Maj. Gen. Hamid Hamouda, the chief of the military judicial department, said that the opening session of the trial would be open to the public. The trial judges, he said, will determine whether subsequent sessions will be open. The trial's location is still undisclosed.

The official indictment listed Sadat's killers as Lt. Khalid Ahmed Shawki Islambouli, the commander of an artillery squad taking part in the military parade where Sadat was killed; Atta Tayem Hamida Rahim, an engineer and former reserve officer in the Egyptian Air Defense Command; Sgt. Hussein Abbas Mohammed, a member of the Home Guard, and Abdel Halim Abdel Salim Abdel Ali, a stationery store owner. All are charged with shooting Sadat.

A fifth man indicted was a Cairo engineer named Abdel Salam Farag, whom other sources have identified as a civilian leader of an underground Muslim fundamentalist group known as El Jihad, meaning "the holy war," and who is believed to have been the leader of Islambouli's secret terrorist cell. He was charged with conspiracy, incitement and abetting the four assassins "to shed innocent blood through the wrong interpretation of Islamic teachings."

Four others, a furniture dealer and three university students, all from the southern Nile River city of Assyut, where an insurrection broke out two days after Sadat's assassination, were accused of conspiracy in the murder through their support of the four men charged with shooting Sadat.

These nine men were said to have been linked to the same Moslem fundamentalist underground cell, whose spiritual leader was Omar Ahmed Abdel Rahman, a fiery mullah who was also a professor of theology from Al Azhar University, Egypt's principal center for Islamic studies. The blind Rahman was indicted for conspiracy in the assassination. According to his indictment, he "accepted the leadership of their renegade group" even though he knew of their plans to kill Sadat.

The remaining 14 men indicted on various other conspiracy charges were all members of another group, or cell, that according to the indictment had helped Sadat's killers get arms, ammunition and hand grenades.