A286571 - cp's OEIS frontend

A286571 Compound filter (prime signature of n & n/gcd(n, sigma(n))): a(n) = P(A046523(n), A017666(n)), where P(n,k) is sequence A000027 used as a pairing function.

n	a(n)
1	1
2	5
3	8
4	25
5	17
6	21
7	30
8	113
9	70
10	51
11	68
12	103
13	93
14	72
15	51
16	481
17	155
18	148
19	192
20	222
21	331
22	126
23	278
24	324
25	382
26	159
27	569
28	78
29	437
30	591
31	498
32	1985
33	126
34	237
35	786
36	2521
37	705
38	282
39	952
40	375
41	863
42	660
43	948
44	243
45	337
46	384
47	1130
48	1759
49	1330
50	1842
51	237
52	678
53	1433
54	520
55	1776
56	459
57	1897
58	567
59	1772
60	2076
61	1893
62	636
63	2713
64	8065
65	2421
66	810
67	2280
68	1002
69	384
70	2046

[1, 5, 8, 25, 17, 21, 30, 113, 70, 51, 68, 103, 93, 72, 51, 481, 155, 148, 192, 222, 331, 126, 278, 324, 382, 159, 569, 78, 437, 591, 498, 1985, 126, 237, 786, 2521, 705, 282, 952, 375, 863, 660, 948, 243, 337, 384, 1130, 1759, 1330, 1842, 237, 678, 1433, 520, 1776, 459, 1897, 567, 1772, 2076, 1893, 636, 2713, 8065, 2421, 810, 2280, 1002, 384, 2046]

cp's OEIS Frontend

A286571 Compound filter (prime signature of n & n/gcd(n, sigma(n))): a(n) = P(A046523(n), A017666(n)), where P(n,k) is sequence A000027 used as a pairing function.

Table of values

List of values