The book is now available! 16361
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+
Russo's Truncated Palindromic Prime Pyramid
 16361
 1163611
 311636113
 33116361133
 3331163611333
 333311636113333

+ The only five-digit palindromic prime formed from the three triangular digits. [Silva]

+ Repeat each digit d times and you will have another palindromic prime. [Silva]

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