The book is now available! 3221
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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The smallest prime (emirp) formed by concatenating the sum and the product of digits of a number n, with the number n, (case n=21). Shall we call 3221 an SPn prime? [Loungrides]


  Submitted: 2010-11-07 02:38:11;   Last Modified: 2018-10-17 08:56:11.

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