Sayan Datta successfully completed an online course in Introduction to Mathematical Thinking provided by Stanford University through Coursera with distinction. The eight-week course focused on developing mathematical thinking skills through lectures, quizzes, ungraded assignments, and graded problem sets covering topics like logical combinators, implication, quantifiers, proofs, number theory, and real analysis. The certificate acknowledges Datta's completion of the online course but does not confer a Stanford grade, credit, or degree.