Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A gigantic prime is a prime number with at least 10,000 decimal digits. The term appeared in Journal of Recreational Mathematics in the article "Collecting gigantic and titanic primes" (1992) by Samuel Yates. Chris Caldwell, who continued Yates' collection in the prime pages, reports that he changed the requirement from Yates' original 5,000 digits to 10,000 digits, when he was asked to revise the article after the death of Yates. Few primes of that size were known then, but a modern PC can find many in a day.

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