decompwlj 3D

Numbers m such that m and 2*m + 5 are both prime

A023205 on the OEIS · family primes

Weight–level plate of Numbers m such that m and 2*m + 5 are both prime
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 viewerA023205 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,996
Level class, k > L44,835 · 44.84 %
Weight class, k ≤ L55,161 · 55.16 %
Ties, k = L32
On the level line L = 116,743
Forced level, l ≤ d²142
Range of a(n)3 … 13,957,981
Range of the jump d4 … 1,638
Largest weight k, level L13,956,721, 1,992,925

203 different gaps occur, from 4 to 1,638; the level share is 44.84 %; L = 1 holds 37 % of the level class.

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.