decompwlj 3D

Alternate number system in base 5

A084545 on the OEIS · family digit rule

Weight–level plate of Alternate number system in base 5
Click the plate to explore it in 3-D. Weight k across, level L up, both on log scales: blue in the weight class (k ≤ L), orange in the level class (k > L). The dashed diagonal is k = L.
Open in the 3-D viewerA084545 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,991
Level class, k > L12,873 · 12.87 %
Weight class, k ≤ L87,118 · 87.13 %
Ties, k = L13
On the level line L = 110,525
Forced level, l ≤ d²235
Range of a(n)1 … 11,144,445
Range of the jump d1 … 5,555,556
Largest weight k, level L11,144,429, 5,572,221

8 different gaps occur, from 1 to 5,555,556; the level share is 12.87 %; L = 1 holds 82 % of the level class; 9 terms do not decompose.

The decomposition

Every term of a strictly increasing sequence is written a(n) = k(n)·L(n) + d(n): the jump d = a(n+1) − a(n), the weight k the least divisor of a − d greater than d, the level L = (a − d)/k. A term decomposes when a > 2d; it is in the level class when k > L and in the weight class when k ≤ L. See decompwlj.com and arXiv:0711.0865, or how it works, with worked examples and a live one.