decompwlj 3D

Primes with minimal digit > 4

A106112 on the OEIS · family primes

Weight–level plate of Primes with minimal digit > 4
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 viewerA106112 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,992
Level class, k > L27,902 · 27.90 %
Weight class, k ≤ L72,090 · 72.10 %
Ties, k = L4
On the level line L = 15,532
Forced level, l ≤ d²782
Range of a(n)5 … 888,989,977
Range of the jump d2 … 455,555,598
Largest weight k, level L888,986,711, 296,329,285

530 different gaps occur, from 2 to 455,555,598; the level share is 27.90 %; 8 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.