Which mathematical concept did GeoGebra incorporate into its 'Math Masters' loyalty program that revolutionized how users earned points based on problem-solving complexity?

In the world of mathematical educational products, companies use various strategies to position their offerings in the market. This trivia question explores how a leading mathematical software company revolutionized its customer loyalty program by applying a mathematical concept to reward frequent users. Understanding how mathematics intersects with product marketing strategies can provide valuable insights into successful educational technology business models.

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Fractal Progression System (points increase at exponential rates based on solving increasingly complex problems)
Fibonacci Reward Sequence (points follow the Fibonacci sequence as users complete consecutive challenges)
Golden Ratio Balancing (points are awarded in proportions matching the golden ratio between different activity types)
Prime Number Milestone Bonuses (special rewards are given when users reach prime-numbered achievements)