|
%I #15 Dec 30 2015 15:03:02
%S 4,5,9,12,15,20,21,22,24,26,29,30,31,32,34,35,36,37,38,40,43,44,53,55,
%T 56,58,59,60,62,64,66,67,68,69,70,71,74,76,77,80,82,84,86,87,88,90,91,
%U 92,94,95,102,103,104,105,106,108,109,110,112,113,115,117,122,123,129,131,132,133,135,136,137,138,139,140,141,143,144,147
%N Positive integers N such that 1/N = p/q - q/p + r/s - s/r for some positive integers p,q,r,s.
%C Positive integer N belongs to this sequence if and only if the elliptic curve y^2 = x^3 + (8*N^2+1)*x^2 + 16*N^4*x has positive rank.
%o (PARI) { isA228914(n) = ellanalyticrank(ellinit([0, 8*n^2+1, 0, 16*n^4, 0]))[1]; } /* _Max Alekseyev_, Dec 30 2015 */
%Y Cf. A206334, A228380
%K nonn
%O 1,1
%A _Thomas Bokk_, Sep 13 2013
%E More terms from _Max Alekseyev_, Sep 13 2013
|
