0,2

Table of n, a(n) for n=0..3.

(PARI) {a(n) = my(k=1); while(ellanalyticrank(ellinit([0, -k+1, 0, -k, 0]))[1]<>n, k++); k}

Cf. A309163.

Sequence in context: A177563 A177569 A327645 * A127183 A054952 A101148

Adjacent sequences: A309162 A309163 A309164 * A309166 A309167 A309168

nonn,more

Seiichi Manyama, Jul 15 2019

approved