decompwlj 3D

Primes of the form 13*k + 3

A100202 on the OEIS · family primes

Weight–level plate of Primes of the form 13*k + 3
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 viewerA100202 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,997
Level class, k > L42,662 · 42.66 %
Weight class, k ≤ L57,335 · 57.34 %
Ties, k = L20
On the level line L = 16,908
Forced level, l ≤ d²250
Range of a(n)3 … 18,801,383
Range of the jump d26 … 1,638
Largest weight k, level L18,797,951, 695,191

61 different gaps occur, from 26 to 1,638; the level share is 42.66 %.

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.