login
A341547
Number of rings with additive group (Z/nZ)^2.
3
1, 8, 8, 66, 8, 64, 8, 301, 175, 64, 8, 528, 8, 64, 64
OFFSET
1,2
LINKS
B. Fine, Classification of Finite Rings of Order p^2, Mathematics Magazine, 66(4) (1993), 248-252.
C. R. Fletcher, Rings of Small Order, The Mathematical Gazette, 64(427) (1980), 9-22.
Christof Nöbauer, Home page
MATHEMATICA
Clear[phi]; phi[1] = 1; phi[p_, 1] := 8; phi[2, 2] = 66;
phi[2, 3] = 301; phi[3, 2] = 175; phi[n_]:= Module[{aux = FactorInteger[n]}, Product[phi[aux[[i, 1]], aux[[i, 2]]], {i, Length[aux]}]];
KEYWORD
nonn,mult,more
AUTHOR
STATUS
approved