Talk:Titanic Prime consisting of 111 Blocks of each Digit plus Zeroes

Yep, I am 90% sure this is not prime: $397$ is a factor.

The expression I used is: ((10^111-1)/9*(10^888 + 2*10^777 + 3*10^666 + 4*10^555 + 5*10^444 + 6*10^333 + 7*10^222 + 8*10^111 + 9))*10^x+1

Replace x with the number of zeroes + 1.

For $1 \le x < 5000$, I have found 3 primes. (took around 2 hours)

They have $399, 1667$ and $1917$ zeros respectively.

I doubt it is a typo this time. --RandomUndergrad (talk) 15:30, 6 March 2022 (UTC)