Hard Logic Sequence Puzzle

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?




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Can you find the least possible number such that

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A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

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A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

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In an office's desk, you find a unique method that shows the current day of the month. Two numbered cubes are used to depict the current date.

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Can you find out the number that should replace the question mark with a valid reason?

Replace Question Mark Riddle

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Rubik’s Cube

The inventor of the Rubik’s Cube didn’t realize he’d built a puzzle until he scrambled it the first time and tried to restore it.