OFFSET
0,2
COMMENTS
See A309029 for the smallest negative k.
LINKS
B. J. Birch and H. P. F. Swinnerton-Dyer, Notes on elliptic curves, I, J. Reine Angew. Math., 212 (1963), 7-25.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Seiichi Manyama, Jul 08 2019
EXTENSIONS
a(5) from Vaclav Kotesovec, Jul 14 2019
STATUS
approved