Which innovative pricing strategy did the educational software company 'MathMinds' use for its advanced calculus learning platform in 2021 that resulted in a 42% increase in student subscriptions?

In the world of educational mathematics products, pricing strategies often incorporate unique mathematical concepts to appeal to their target audience. Companies selling math textbooks, software, and learning tools have experimented with various pricing models that reflect mathematical principles. This trivia question explores how one innovative company used mathematics itself as a pricing strategy.

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Dynamic sequence pricing: The price decreased according to the Fibonacci sequence with each month of continued subscription
Prime number discount: Customers received percentage discounts equal to the nearest prime number to their age
Pi-based pricing: The software cost exactly $31.41 with an additional $2.72 (e) for each advanced module
Golden ratio tiers: Three subscription tiers were priced in exact proportion to the golden ratio (approximately 1:1.618)