decompwlj 3D

Positive integers that have exactly 6 odd divisors

A230577 on the OEIS · family divisor functions

Weight–level plate of Positive integers that have exactly 6 odd 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 viewerA230577 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)100,000
Level class, k > L24,856 · 24.86 %
Weight class, k ≤ L75,144 · 75.14 %
Ties, k = L19
On the level line L = 17,358
Forced level, l ≤ d²14
Range of a(n)45 … 2,315,800
Range of the jump d1 … 309
Largest weight k, level L2,315,611, 1,157,899

173 different gaps occur, from 1 to 309; the level share is 24.86 %.

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.