A342670 - cp's OEIS frontend

A342670 a(n) = gcd(nsigma(A064989(n)), sigma(n)A064989(n)), where A064989 is multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p, and sigma gives the sum of the divisors of its argument.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	6
7	2
8	1
9	1
10	2
11	4
12	4
13	2
14	12
15	36
16	1
17	2
18	6
19	2
20	2
21	2
22	4
23	4
24	24
25	1
26	6
27	5
28	56
29	6
30	72
31	2
32	1
33	24
34	2
35	120
36	28
37	2
38	12
39	4
40	10
41	2
42	12
43	2
44	4
45	36
46	8
47	4
48	8
49	1
50	1
51	18
52	2
53	6
54	30
55	8
56	24
57	2
58	6
59	6
60	144
61	2
62	12
63	2
64	1
65	12
66	144
67	2
68	14
69	12
70	240
71	4
72	12
73	2
74	2
75	9
76	4
77	336
78	24
79	2
80	2
81	1
82	2
83	4
84	56
85	4
86	12
87	24
88	4
89	6
90	72
91	56
92	8
93	2
94	8
95	360

[1, 1, 1, 1, 2, 6, 2, 1, 1, 2, 4, 4, 2, 12, 36, 1, 2, 6, 2, 2, 2, 4, 4, 24, 1, 6, 5, 56, 6, 72, 2, 1, 24, 2, 120, 28, 2, 12, 4, 10, 2, 12, 2, 4, 36, 8, 4, 8, 1, 1, 18, 2, 6, 30, 8, 24, 2, 6, 6, 144, 2, 12, 2, 1, 12, 144, 2, 14, 12, 240, 4, 12, 2, 2, 9, 4, 336, 24, 2, 2, 1, 2, 4, 56, 4, 12, 24, 4, 6, 72, 56, 8, 2, 8, 360]

cp's OEIS Frontend

A342670 a(n) = gcd(nsigma(A064989(n)), sigma(n)A064989(n)), where A064989 is multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p, and sigma gives the sum of the divisors of its argument.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	6
7	2
8	1
9	1
10	2
11	4
12	4
13	2
14	12
15	36
16	1
17	2
18	6
19	2
20	2
21	2
22	4
23	4
24	24
25	1
26	6
27	5
28	56
29	6
30	72
31	2
32	1
33	24
34	2
35	120
36	28
37	2
38	12
39	4
40	10
41	2
42	12
43	2
44	4
45	36
46	8
47	4
48	8
49	1
50	1
51	18
52	2
53	6
54	30
55	8
56	24
57	2
58	6
59	6
60	144
61	2
62	12
63	2
64	1
65	12
66	144
67	2
68	14
69	12
70	240
71	4
72	12
73	2
74	2
75	9
76	4
77	336
78	24
79	2
80	2
81	1
82	2
83	4
84	56
85	4
86	12
87	24
88	4
89	6
90	72
91	56
92	8
93	2
94	8
95	360

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	6
7	2
8	1
9	1
10	2
11	4
12	4
13	2
14	12
15	36
16	1
17	2
18	6
19	2
20	2
21	2
22	4
23	4
24	24
25	1
26	6
27	5
28	56
29	6
30	72
31	2
32	1
33	24
34	2
35	120
36	28
37	2
38	12
39	4
40	10
41	2
42	12
43	2
44	4
45	36
46	8
47	4
48	8
49	1
50	1
51	18
52	2
53	6
54	30
55	8
56	24
57	2
58	6
59	6
60	144
61	2
62	12
63	2
64	1
65	12
66	144
67	2
68	14
69	12
70	240
71	4
72	12
73	2
74	2
75	9
76	4
77	336
78	24
79	2
80	2
81	1
82	2
83	4
84	56
85	4
86	12
87	24
88	4
89	6
90	72
91	56
92	8
93	2
94	8
95	360

cp's OEIS Frontend

A342670 a(n) = gcd(n*sigma(A064989(n)), sigma(n)*A064989(n)), where A064989 is multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p, and sigma gives the sum of the divisors of its argument.

Table of values

List of values

A342670 a(n) = gcd(nsigma(A064989(n)), sigma(n)A064989(n)), where A064989 is multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p, and sigma gives the sum of the divisors of its argument.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	6
7	2
8	1
9	1
10	2
11	4
12	4
13	2
14	12
15	36
16	1
17	2
18	6
19	2
20	2
21	2
22	4
23	4
24	24
25	1
26	6
27	5
28	56
29	6
30	72
31	2
32	1
33	24
34	2
35	120
36	28
37	2
38	12
39	4
40	10
41	2
42	12
43	2
44	4
45	36
46	8
47	4
48	8
49	1
50	1
51	18
52	2
53	6
54	30
55	8
56	24
57	2
58	6
59	6
60	144
61	2
62	12
63	2
64	1
65	12
66	144
67	2
68	14
69	12
70	240
71	4
72	12
73	2
74	2
75	9
76	4
77	336
78	24
79	2
80	2
81	1
82	2
83	4
84	56
85	4
86	12
87	24
88	4
89	6
90	72
91	56
92	8
93	2
94	8
95	360