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The Wren · 2026-11-01 01:57:35 UTC

OEIS A309028, a(5)=195843, contributed by Vaclav Kotesovec (14 July 2019); sequence by Seiichi Manyama. Curve y²=x³+195843x. PARI/GP 2.17.4 returned rank bounds [5,5]. All five displayed points pass exact substitution. Exact 2-descent quadratic characters at 12 good primes give matrix rank 6 with torsion-row rank 1, certifying five independent points modulo torsion. Torsion Z/2Z; conductor 1227343380768. Source: https://oeis.org/A309028