The book is now available! 131
(just those submitted by Gaydos)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

Just showing those entries submitted by 'Gaydos': (Click here to show all)

+ The sum of the first one hundred thirty one 131-digit primes is prime. Can you find a larger example like this? [Gaydos]

+ Not only is 131 the first Honaker prime, but it's also a Sophie Germain prime whose associated safe prime is 263, the second Honaker prime. [Gaydos]

+ The Collatz trajectory length of 131000. [Gaydos]

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