login
A187717
a(n) = A001676(n) / A187595(n).
1
1, 1, 1, 1, 1, 1, 1, 2, 4, 6, 1, 1, 3, 2, 2, 2, 8, 16, 2, 24, 4, 4, 48, 2, 2, 12, 1, 2, 3, 3, 4, 8, 16, 32, 4, 6, 12, 120, 96, 192, 16, 96, 1, 8, 5760, 48, 96, 32, 6, 24, 16, 24, 16, 8, 3, 1, 4, 4, 4, 4, 1, 24, 16
OFFSET
1,8
COMMENTS
The quotient of |Theta_n| and |bP_(n+1)| in the 1961 Kervaire-Milnor theorem.
The quotient of |S_n| and |S_n^{bp}| in the 2011 Milnor survey (see Theorem 5, Further Details, and Table 2). - Jonathan Sondow, Jun 16 2011
LINKS
Michel A. Kervaire and John W. Milnor, Groups of homotopy spheres: I, 1963
Michel A. Kervaire and John W. Milnor, Groups of homotopy spheres: I. Ann. of Math. (2) 77 1963, 504-537.
John W. Milnor, Differential Topology Forty-six Years Later, Notices Amer. Math. Soc. 58 (2011), 804-809.
John W. Milnor, Spheres, Abel Prize lecture (video), 2011.
Wikipedia, Exotic sphere
CROSSREFS
Sequence in context: A013082 A352639 A197388 * A125944 A077069 A261596
KEYWORD
nonn,hard
AUTHOR
Paul Muljadi, Mar 18 2011
EXTENSIONS
More terms from Jonathan Sondow, Jun 16 2011
Terms a(56), a(57), a(63) corrected by Andrey Zabolotskiy, Nov 27 2022
STATUS
approved