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This probably falls under the category of ‘Why bother’. However, there has been some recent interest in calculating arbitrarily large fibonacci numbers. There is nothing particularly difficult about calculating these numbers until you reach the maximum number that a bigint (or decimal) can hold. With Fibonacci numbers, you reach this limit pretty fast. There’s nothing particularly difficult about calculating this sequence, it merely involves adding 2 numbers together. But, since we run in to the data type limit, we need to start thinking outside the box.