11111...11111 (1410-digits)

This number is a prime.

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

(10^1410-1)/9+5*10^655 is the smallest titanic near-repdigit prime that gives a different prime when rotated by 180 degress about an axis perpendicular to the page. Its twin prime is (10^1410-1)/9+8*10^754. [Broadhurst]