The book is now available! 753266429
(just those submitted by Green)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share/Bookmark

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

+
The center column of this 9-level palindromic
prime pyramid is the emirp 753266429.

There are 5 more 9-level palindromic prime pyramids like
this that contain a prime number (starting with '7')
down the center column.
Can you find them?
 7
757
77377
7772777
777767777
77777677777
7777774777777
777777727777777
77777777977777777
[Green]



Prime Curios! © 1999-2013 (all rights reserved)