1,2

Values of m in coprime solutions to 2m^4 = c^4 + d^2 (so that a, b = (c^2 +- d)/2).

Corresponding values of c are given in A167437.

Terms with positive a,b,c are given in A166930.

Table of n, a(n) for n=1..10.

a/m^2 = (-8*u^2 + 32*v + u^4 + 4*v^2 - 4*u^3 + 16*u*v)/(8 + u^2 + 4*u)^2 and b/m^2 = (4*u^3 - 8*u^2 - 4*v*u^2 - 16*u*v + 64)/(8 + u^2 + 4*u)^2 where (u,v) is a rational point on the elliptic curve v^2 = u^3 + 8*u.

Sequence in context: A185193 A066457 A203515 * A079917 A028450 A201177

Adjacent sequences: A166926 A166927 A166928 * A166930 A166931 A166932

nonn

Max Alekseyev, Oct 23 2009

Edited by Max Alekseyev, Nov 03 2009

approved