1,1

Alois P. Heinz, Table of n, a(n) for n = 1..20000 (first 1216 terms from N. J. A. Sloane)

Rémy Sigrist, Colored scatterplot of (x,y) such that A275609(x,y) = 2 and -500 <= x <= 500 and -500 <= y <= 500 (where the color is function of (x mod 2) + 2 * (y mod 2))

Cf. A275609, A307188-A307192.

Sequence in context: A329603 A309546 A261543 * A183409 A262867 A024808

Adjacent sequences: A307187 A307188 A307189 * A307191 A307192 A307193

nonn

N. J. A. Sloane, Mar 28 2019

approved