OFFSET
1,2
COMMENTS
Integer N>1 belongs to this sequence if and only if the elliptic curve y^2 = x^3 - (N^2+1)*x^2 + N^2*x has positive rank.
PROG
(PARI) { isA228380(n) = ellanalyticrank(ellinit([0, -(n^2+1), 0, n^2, 0]))[1]; } /* Max Alekseyev, Sep 29 2015 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Thomas Bokk, Aug 21 2013
EXTENSIONS
More terms from Max Alekseyev, Sep 29 2015
STATUS
approved