0,4

It is conjectured that every nonnegative number appears on the x-axis exactly once.

a(n) is also the distance to the origin from the point n+1 on the x-axis in A274640.

Needs a large b-file: it will be interesting to see how irregular this sequence is.

Table of n, a(n) for n=0..24.

The portion of the x-axis near 0 is:

... 14 6 5 4 2 0 1 3 7 10 11 ...

and we see that both 1 and 2 are at distance 1 from 0. So a(1) = a(2) = 1.

Cf. A274640, A274641.

The positive and negative x-axes are given in A274924 and A274928.

Sequence in context: A284199 A284165 A284113 * A164975 A253889 A228754

Adjacent sequences: A324477 A324478 A324479 * A324481 A324482 A324483

nonn,more

N. J. A. Sloane, Mar 11 2019

approved