decompwlj 3D

Primes congruent to {1, 2} mod 5

A045372 on the OEIS · family primes

Weight–level plate of Primes congruent to {1, 2} mod 5
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 viewerA045372 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,996
Level class, k > L30,270 · 30.27 %
Weight class, k ≤ L69,726 · 69.73 %
Ties, k = L7
On the level line L = 15,772
Forced level, l ≤ d²22
Range of a(n)2 … 2,748,971
Range of the jump d4 … 246
Largest weight k, level L2,747,791, 392,529

66 different gaps occur, from 4 to 246; the level share is 30.27 %.

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.