A356204 a(n) is the second component y of the distance vector (x,y) in an oblique 120-degree coordinate system, 0 <= y <= x, between two nodes of an infinite triangular lattice of one-ohm resistors, such that the resistance R between the two nodes is as close as possible to n ohms, i.e., abs(R - n) is minimized. x is A356203(n).

0, 18, 2536, 1136101, 119227930, 33636581266, 1774960492720, 685318499093455

Offset

0,2

Links

Table of n, a(n) for n=0..7.

Example

See table in A356203.

Crossrefs

Cf. A355585, A355586, A355587, A355588, A355589, A355954.

Cf. A356201, A356202 (similar for square lattice).

Sequence in context: A282830 A174637 A267065 * A243215 A162449 A318297

Adjacent sequences: A356201 A356202 A356203 * A356205 A356206 A356207

Keyword

nonn,hard,more

Author

Hugo Pfoertner, Aug 13 2022

Status

approved