A336849 - cp's OEIS frontend

A336849 a(n) = A003961(n) / gcd(A003961(n), sigma(A003961(n))), where A003961 is the prime shift towards larger primes.

n	a(n)
1	1
2	3
3	5
4	9
5	7
6	5
7	11
8	27
9	25
10	21
11	13
12	15
13	17
14	11
15	35
16	81
17	19
18	75
19	23
20	63
21	55
22	39
23	29
24	9
25	49
26	17
27	125
28	33
29	31
30	35
31	37
32	243
33	65
34	57
35	77
36	225
37	41
38	23
39	85
40	189
41	43
42	55
43	47
44	9
45	175
46	29
47	53
48	135
49	121
50	49
51	19
52	17
53	59
54	125
55	13
56	99
57	115
58	93
59	61
60	105
61	67
62	111
63	275
64	729
65	119
66	65
67	71
68	171
69	29
70	77
71	73
72	135
73	79
74	41
75	245
76	69
77	143

[1, 3, 5, 9, 7, 5, 11, 27, 25, 21, 13, 15, 17, 11, 35, 81, 19, 75, 23, 63, 55, 39, 29, 9, 49, 17, 125, 33, 31, 35, 37, 243, 65, 57, 77, 225, 41, 23, 85, 189, 43, 55, 47, 9, 175, 29, 53, 135, 121, 49, 19, 17, 59, 125, 13, 99, 115, 93, 61, 105, 67, 111, 275, 729, 119, 65, 71, 171, 29, 77, 73, 135, 79, 41, 245, 69, 143]

cp's OEIS Frontend

A336849 a(n) = A003961(n) / gcd(A003961(n), sigma(A003961(n))), where A003961 is the prime shift towards larger primes.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	9
5	7
6	5
7	11
8	27
9	25
10	21
11	13
12	15
13	17
14	11
15	35
16	81
17	19
18	75
19	23
20	63
21	55
22	39
23	29
24	9
25	49
26	17
27	125
28	33
29	31
30	35
31	37
32	243
33	65
34	57
35	77
36	225
37	41
38	23
39	85
40	189
41	43
42	55
43	47
44	9
45	175
46	29
47	53
48	135
49	121
50	49
51	19
52	17
53	59
54	125
55	13
56	99
57	115
58	93
59	61
60	105
61	67
62	111
63	275
64	729
65	119
66	65
67	71
68	171
69	29
70	77
71	73
72	135
73	79
74	41
75	245
76	69
77	143

n	a(n)
1	1
2	3
3	5
4	9
5	7
6	5
7	11
8	27
9	25
10	21
11	13
12	15
13	17
14	11
15	35
16	81
17	19
18	75
19	23
20	63
21	55
22	39
23	29
24	9
25	49
26	17
27	125
28	33
29	31
30	35
31	37
32	243
33	65
34	57
35	77
36	225
37	41
38	23
39	85
40	189
41	43
42	55
43	47
44	9
45	175
46	29
47	53
48	135
49	121
50	49
51	19
52	17
53	59
54	125
55	13
56	99
57	115
58	93
59	61
60	105
61	67
62	111
63	275
64	729
65	119
66	65
67	71
68	171
69	29
70	77
71	73
72	135
73	79
74	41
75	245
76	69
77	143

n	a(n)
1	1
2	3
3	5
4	9
5	7
6	5
7	11
8	27
9	25
10	21
11	13
12	15
13	17
14	11
15	35
16	81
17	19
18	75
19	23
20	63
21	55
22	39
23	29
24	9
25	49
26	17
27	125
28	33
29	31
30	35
31	37
32	243
33	65
34	57
35	77
36	225
37	41
38	23
39	85
40	189
41	43
42	55
43	47
44	9
45	175
46	29
47	53
48	135
49	121
50	49
51	19
52	17
53	59
54	125
55	13
56	99
57	115
58	93
59	61
60	105
61	67
62	111
63	275
64	729
65	119
66	65
67	71
68	171
69	29
70	77
71	73
72	135
73	79
74	41
75	245
76	69
77	143