Zero Sink

Tuesday, September 08, 2009

World Record Palindromic Prime

This morning I discovered another strobogrammatic tetradic palindromic prime number:


Written out, that's a one, followed by 60743 zeros, 58567 eights, 60743 more zeros and finally another one. It's symmetrical about the vertical and horizontal axes.

As of today, it's the largest palindromic prime number (in base ten) known.

Here's the current list of the top 20.