A242720 - cp's OEIS frontend

A242720 Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639).

n	a(n)
2	12
3	38
4	80
5	212
6	224
7	440
8	440
9	854
10	1250
11	1460
12	1742
13	2282
14	2282
15	3434
16	4190
17	4664
18	4760
19	4760
20	6890
21	8054
22	8054
23	8054
24	12374
25	12830
26	12830
27	13592
28	13592
29	14282
30	17402
31	17402
32	18212
33	22502
34	22502
35	22502
36	25220
37	28202
38	28202
39	32234
40	32402
41	32402
42	38012

[12, 38, 80, 212, 224, 440, 440, 854, 1250, 1460, 1742, 2282, 2282, 3434, 4190, 4664, 4760, 4760, 6890, 8054, 8054, 8054, 12374, 12830, 12830, 13592, 13592, 14282, 17402, 17402, 18212, 22502, 22502, 22502, 25220, 28202, 28202, 32234, 32402, 32402, 38012]

cp's OEIS Frontend

A242720 Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639).

Table of values

List of values