decompwlj 3D

Primes congruent to 20 mod 39

A142171 on the OEIS · family primes

Weight–level plate of Primes congruent to 20 mod 39
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 viewerA142171 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,996
Level class, k > L53,588 · 53.59 %
Weight class, k ≤ L46,408 · 46.41 %
Ties, k = L0
On the level line L = 116,375
Forced level, l ≤ d²589
Range of a(n)59 … 39,390,761
Range of the jump d78 … 3,822
Largest weight k, level L39,383,273, 494,657

43 different gaps occur, from 78 to 3,822; the level share is 53.59 %; L = 1 holds 31 % of the level class; there are no ties.

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.