decompwlj 3D

Good primes (version 1): prime(n)^2 > prime(n-1)*prime(n+1)

A046869 on the OEIS · family primes

Weight–level plate of Good primes (version 1): prime(n)^2 > prime(n-1)*prime(n+1)
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 viewerA046869 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,997
Level class, k > L30,850 · 30.85 %
Weight class, k ≤ L69,147 · 69.15 %
Ties, k = L20
On the level line L = 19,037
Forced level, l ≤ d²16
Range of a(n)5 … 2,643,733
Range of the jump d4 … 182
Largest weight k, level L2,643,647, 377,337

82 different gaps occur, from 4 to 182; the level share is 30.85 %.

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.