decompwlj 3D

Numbers with 40 divisors

A175749 on the OEIS · family multiplicative

Weight–level plate of Numbers with 40 divisors
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 viewerA175749 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)100,000
Level class, k > L27,893 · 27.89 %
Weight class, k ≤ L72,107 · 72.11 %
Ties, k = L2
On the level line L = 1774
Forced level, l ≤ d²192
Range of a(n)1,680 … 9,667,056
Range of the jump d1 … 926
Largest weight k, level L9,654,899, 4,832,743

513 different gaps occur, from 1 to 926; the level share is 27.89 %; L = 16 holds 38 % of the level class.

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.