login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A356730 Conductor of the elliptic curve y^2 = x^3 + n. 2

%I #11 Aug 25 2022 09:54:35

%S 36,1728,3888,108,2700,15552,21168,576,972,14400,52272,3888,18252,

%T 84672,97200,27,10404,15552,51984,2700,47628,209088,228528,15552,2700,

%U 97344,144,7056,90828,388800,415152,1728,117612,499392,176400,972,49284,623808,657072,43200,181548

%N Conductor of the elliptic curve y^2 = x^3 + n.

%C The discriminant of the elliptic curve y^2 = x^3 - n is -432*n^2 and the rank is A060950(n).

%C a(n*t^6) = a(n) for all t since the elliptic curve y^2 = x^3 + n*t^6 can be written as (y/t^3)^2 = (x/t^2)^3 + n, and the conductor is an invariant of elliptic curves.

%C Conjectures: (Start)

%C (i) a(27*n) = A356731(n) for all n.

%C (ii) a(n) is divisible by 36, and a(n) = 36 <=> n is a sixth power, a(n) = 108 <=> n is 4 times a sixth power, a(n) = 144 <=> n is 27 times a sixth power; moreover, it seems that a(n) is divisible by 36*n^2 if n is squarefree. (End)

%H Jianing Song, <a href="/A356730/b356730.txt">Table of n, a(n) for n = 1..10000</a>

%H LMFDB, <a href="https://www.lmfdb.org/EllipticCurve/Q/">Elliptic Curves Over Q</a>

%o (PARI) a(n) = ellglobalred(ellinit([0,0,0,0,n]))[1]

%Y Cf. A356731, A060950.

%K nonn

%O 1,1

%A _Jianing Song_, Aug 24 2022

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 8 02:48 EDT 2024. Contains 375018 sequences. (Running on oeis4.)