decompwlj 3D

Primes occurring only once in their decade

A078494 on the OEIS · family primes

Weight–level plate of Primes occurring only once in their decade
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 viewerA078494 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)100,000
Level class, k > L27,115 · 27.11 %
Weight class, k ≤ L72,885 · 72.89 %
Ties, k = L13
On the level line L = 16,945
Forced level, l ≤ d²40
Range of a(n)97 … 2,398,441
Range of the jump d2 … 228
Largest weight k, level L2,398,367, 799,059

91 different gaps occur, from 2 to 228; the level share is 27.11 %.

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.