decompwlj 3D

Multiples of 15

A008597 on the OEIS · family residue class

Weight–level plate of Multiples of 15
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 viewerA008597 on the OEIS
Terms100,000 (n = 0 … 99,999)
Decomposable (a > 2d)99,997
Level class, k > L9,610 · 9.61 %
Weight class, k ≤ L90,387 · 90.39 %
Ties, k = L0
On the level line L = 12
Forced level, l ≤ d²14
Range of a(n)0 … 1,499,985
Range of the jump d15 … 15
Largest weight k, level L99,991, 93,735

The gap is always 15; the level share is 9.61 %; L = 15 holds 100 % 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.