decompwlj 3D

Primes having only {2, 3, 4} as digits

A199342 on the OEIS · family primes

Weight–level plate of Primes having only {2, 3, 4} as digits
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 viewerA199342 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,984
Level class, k > L36,942 · 36.95 %
Weight class, k ≤ L63,042 · 63.05 %
Ties, k = L0
On the level line L = 15,745
Forced level, l ≤ d²2,640
Range of a(n)2 … 23,444,322,324,323
Range of the jump d1 … 17,777,777,778,920
Largest weight k, level L23,444,322,231,623, 2,131,212,940,293

1,236 different gaps occur, from 1 to 17,777,777,778,920; the level share is 36.95 %; 2.6 % of terms are forced level (l <= d^2); there are no ties; 16 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.