A338595 Denominators of resistance values < 1 ohm that can be obtained from a network of exactly 5 one-ohm resistors, but not from any network with fewer than 5 one-ohm resistors. Numerators are in A338580.

5, 7, 8, 7, 7, 8, 7, 5, 6, 7

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

The list of the 20 = A051389(5) resistance values, sorted by increasing size of R = A338580(n)/a(n) = A338605(n)/A338600(5) is [1/5, 2/7, 3/8, 3/7, 4/7, 5/8, 5/7, 4/5, 5/6, 6/7] and the reciprocal resistances > 1 ohm [7/6, 6/5, 5/4, 7/5, 8/5, 7/4, 7/3, 8/3, 7/2, 5/1].

Crossrefs

Cf. A051389, A338580, A338600, A338605.

Cf. A338596, A338597, A338598, A338599, A338590 (similar for n = 6..10).

Sequence in context: A141606 A354051 A197491 * A254274 A068001 A213443

Adjacent sequences: A338592 A338593 A338594 * A338596 A338597 A338598

Keyword

nonn,frac,fini,full

Author

Hugo Pfoertner, Nov 03 2020

Status

approved