decompwlj 3D

Prime having only {0, 1, 4, 9} as digits

A061246 on the OEIS · family primes

Weight–level plate of Prime having only {0, 1, 4, 9} 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 viewerA061246 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,981
Level class, k > L35,455 · 35.46 %
Weight class, k ≤ L64,526 · 64.54 %
Ties, k = L1
On the level line L = 17,676
Forced level, l ≤ d²1,937
Range of a(n)11 … 14,494,144,009
Range of the jump d2 … 4,000,000,910
Largest weight k, level L14,494,109,353, 4,831,369,669

2,392 different gaps occur, from 2 to 4,000,000,910; the level share is 35.46 %; 1.9 % of terms are forced level (l <= d^2); 19 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.