Milnor, John Differential topology forty-six years later. (English) Zbl 1225.01040 Notices Am. Math. Soc. 58, No. 6, 804-809 (2011). Cited in 1 ReviewCited in 18 Documents MSC: 01A60 History of mathematics in the 20th century 57-03 History of manifolds and cell complexes PDFBibTeX XMLCite \textit{J. Milnor}, Notices Am. Math. Soc. 58, No. 6, 804--809 (2011; Zbl 1225.01040) Online Encyclopedia of Integer Sequences: Number of h-cobordism classes of smooth homotopy n-spheres. Order of n-th stable homotopy group of spheres. Order of subgroup bP_{m+1} of group Theta_m of h-cobordism classes of smooth homotopy m-spheres defined by those homotopy m-spheres which bound parallelizable (m+1)-manifolds, where m = 2n+1. a(n) = A001676(n) / A187595(n). The order b_{4n-1} of the cyclic group S_{4n-1}^{bp} of oriented diffeomorphism classes of smooth homotopy (4n-1)-spheres that bound parallelizable manifolds, for n > 1. Numbers k such that the topological k-sphere has a unique differentiable structure up to diffeomorphism. Erroneous version of A191783.