decompwlj 3D

Numbers n such that m = floor(n/4) is coprime to n and, if nonzero, m is also a term of the sequence

A250036 on the OEIS · family self-referential

Weight–level plate of Numbers n such that m = floor(n/4) is coprime to n and, if nonzero, m is also a term of the sequence
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 viewerA250036 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,988
Level class, k > L11,799 · 11.80 %
Weight class, k ≤ L88,189 · 88.20 %
Ties, k = L15
On the level line L = 18,081
Forced level, l ≤ d²340
Range of a(n)1 … 27,106,279
Range of the jump d1 … 9,786,710
Largest weight k, level L27,106,133, 13,553,138

42 different gaps occur, from 1 to 9,786,710; the level share is 11.80 %; L = 1 holds 68 % of the level class; 12 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.