User blog comment:SandstoneGem/Sandstone's number/@comment-30754445-20170607102209/@comment-3427444-20170608053710

I knew that the Fermat number F12 = 2^4096 + 1 is currently the smallest Fermat number that hasn't been completely factored, but this is the first time I've found out that it has exactly 1234 digits.