decompwlj 3D

Numbers of the form 2^(2i+1)*(8j+7)

A055039 on the OEIS · family residue class

Weight–level plate of Numbers of the form 2^(2i+1)*(8j+7)
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 viewerA055039 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,998
Level class, k > L23,709 · 23.71 %
Weight class, k ≤ L76,289 · 76.29 %
Ties, k = L0
On the level line L = 10
Forced level, l ≤ d²12
Range of a(n)14 … 1,200,030
Range of the jump d2 … 16
Largest weight k, level L599,999, 399,860

5 different gaps occur, from 2 to 16; the level share is 23.71 %; L = 2 holds 52 % of the level class; there are no ties.

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.