I like this variant: Complete this sequence: 1, 1, 1, ?, 1, 1, ... If you said infinity, you're right! Number of exotic differentiable structures on R^n. htt

I like this variant: Complete this sequence: 1, 1, 1, ?, 1, 1, ... If you said infinity, you're right! Number of exotic differentiable structures on R^n. https://en.wikipedia.org/wiki/Exotic_R4 https://en.wikipedia.org/wiki/Exotic_R4