decompwlj 3D

Numbers n such that n^2 + n - 1 and n^2 + n + 1 are twin primes

A088485 on the OEIS · family prime values

Weight–level plate of Numbers n such that n^2 + n - 1 and n^2 + n + 1 are twin primes
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 viewerA088485 on the OEIS
Terms100,000 (n = 1 … 100,000)
Decomposable (a > 2d)99,996
Level class, k > L38,592 · 38.59 %
Weight class, k ≤ L61,404 · 61.41 %
Ties, k = L11
On the level line L = 17,490
Forced level, l ≤ d²120
Range of a(n)2 … 11,822,646
Range of the jump d1 … 1,460
Largest weight k, level L11,820,191, 5,843,144

863 different gaps occur, from 1 to 1,460; the level share is 38.59 %.

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.