decompwlj 3D

Primes of the form 4*k^2 + 4*k + 59

A048988 on the OEIS · family primes

Weight–level plate of Primes of the form 4*k^2 + 4*k + 59
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 viewerA048988 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)100,000
Level class, k > L100,000 · 100.00 %
Weight class, k ≤ L0 · 0.00 %
Ties, k = L0
On the level line L = 17,917
Forced level, l ≤ d²100,000
Range of a(n)59 … 716,807,756,083
Range of the jump d8 … 116,656,960
Largest weight k, level L716,777,277,179, 208,417

97,604 different gaps occur, from 8 to 116,656,960; every decomposable term is forced level (l <= d^2).

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.