decompwlj 3D

Numbers that are congruent to {2, 15} mod 19

A169597 on the OEIS · family residue class

Weight–level plate of Numbers that are congruent to {2, 15} mod 19
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 viewerA169597 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,998
Level class, k > L25,350 · 25.35 %
Weight class, k ≤ L74,648 · 74.65 %
Ties, k = L18
On the level line L = 18,308
Forced level, l ≤ d²10
Range of a(n)2 … 949,996
Range of the jump d6 … 13
Largest weight k, level L949,951, 135,702

The gaps are 6 and 13; the level share is 25.35 %; L = 1 holds 33 % 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.