The book is now available! 11111...31111 (55-digits)
(another Prime Pages' Curiosity)
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                11111 1111113333 3331135555 3113575311 3553113531 1331131111
+
1 1 1 1 1 1 1 1 1 1
1 3 3 3 3 3 3 3 1
1 3 5 5 5 5 3 1
1 3 5 7 5 3 1
1 3 5 5 3 1
1 3 5 3 1
1 3 3 1
1 3 1
1 1
1

A triangle-congruent prime consisting of only odd digits. [Patterson]




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