A286452 - cp's OEIS frontend

A286452 Compound filter (largest prime factor of n & prime signature of 2n-1): a(n) = P(A061395(n), A046523(2n-1)), where P(n,k) is sequence A000027 used as a pairing function.

n	a(n)
1	0
2	2
3	5
4	2
5	18
6	5
7	14
8	16
9	5
10	9
11	50
12	5
13	42
14	59
15	9
16	2
17	73
18	23
19	44
20	31
21	14
22	20
23	199
24	5
25	18
26	61
27	5
28	40
29	115
30	9
31	77
32	67
33	50
34	35
35	40
36	5
37	90
38	179
39	61
40	9
41	391
42	14
43	185
44	50
45	9
46	100
47	205
48	23
49	14
50	94
51	35
52	27
53	1006
54	5
55	20
56	40
57	44
58	115
59	395
60	31
61	228
62	131
63	59
64	2
65	61
66	20
67	295
68	442
69	54
70	14
71	320
72	23
73	346
74	265
75	9
76	44
77	125
78	61
79	275
80	31
81	23
82	104
83	1349
84	14
85	52
86	314
87	65
88	125
89	430

[0, 2, 5, 2, 18, 5, 14, 16, 5, 9, 50, 5, 42, 59, 9, 2, 73, 23, 44, 31, 14, 20, 199, 5, 18, 61, 5, 40, 115, 9, 77, 67, 50, 35, 40, 5, 90, 179, 61, 9, 391, 14, 185, 50, 9, 100, 205, 23, 14, 94, 35, 27, 1006, 5, 20, 40, 44, 115, 395, 31, 228, 131, 59, 2, 61, 20, 295, 442, 54, 14, 320, 23, 346, 265, 9, 44, 125, 61, 275, 31, 23, 104, 1349, 14, 52, 314, 65, 125, 430]

cp's OEIS Frontend

A286452 Compound filter (largest prime factor of n & prime signature of 2n-1): a(n) = P(A061395(n), A046523(2n-1)), where P(n,k) is sequence A000027 used as a pairing function.

Table of values

List of values