This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A309030 #14 Sep 08 2022 08:46:21 %S A309030 323,328,399,445,579,723,904,943,1023,1139,1288,1314,1443,1508,1679, %T A309030 1743,1763,1768,1953,2005,2035,2159,2275,2328,2419,2451,2504,2533, %U A309030 2725,2739,2790,2793,2824,2915,2980,3029,3038,3043,3108,3196,3199,3245,3341,3363,3443,3459,3465 %N A309030 Numbers k for which rank of the elliptic curve y^2=x^3+k*x is 3. %o A309030 (PARI) for(k=1, 3e3, if(ellanalyticrank(ellinit([0, 0, 0, k, 0]))[1]==3, print1(k", "))) %o A309030 (Magma) for k in[1..4000] do if Rank(EllipticCurve([0,0,0,k,0])) eq 3 then print k; end if; end for; // _Vaclav Kotesovec_, Jul 08 2019 %Y A309030 Cf. A002158 (rank 0), A002159 (rank 1), A076329 (rank 2), this sequence (rank 3), A309031 (rank 4). %Y A309030 Cf. A309033. %K A309030 nonn %O A309030 1,1 %A A309030 _Seiichi Manyama_, Jul 08 2019