Explore the fascinating world of numbers in this engaging Oxford Mathematics Public Lecture. Delve into the serious and fun aspects of mathematics as renowned mathematician Michael Atiyah shares insights on famous mathematicians like Archimedes and Euler, their groundbreaking discoveries, and the joy of mathematical invention. Learn about important numbers waiting to be discovered and gain inspiration from Atiyah's personal experiences, including his interactions with young mathematicians and his time at the Royal Society. Discover how mathematicians approach problem-solving, find moments of inspiration, and continue to contribute to the field even in their later years. The lecture concludes with an interview by Sir John Ball, offering further insights into Atiyah's life and work as a mathematician.