753266429
This number is a prime.
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 |
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell