A348748 - cp's OEIS frontend

A348748 Odd numbers k for which A064989(sigma(k)) < A064989(k), where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	15
7	17
8	19
9	21
10	23
11	27
12	29
13	31
14	33
15	35
16	37
17	39
18	41
19	43
20	47
21	51
22	53
23	55
24	57
25	59
26	61
27	63
28	65
29	67
30	69
31	71
32	73
33	77
34	79
35	83
36	85
37	87
38	89
39	91
40	93
41	95
42	97
43	99
44	101
45	103
46	105
47	107
48	109
49	111
50	113
51	115
52	119
53	123
54	125
55	127
56	129
57	131
58	133
59	135
60	137
61	139
62	141
63	143
64	145
65	147
66	149
67	151
68	153
69	155
70	157
71	159
72	161
73	163

[3, 5, 7, 11, 13, 15, 17, 19, 21, 23, 27, 29, 31, 33, 35, 37, 39, 41, 43, 47, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 77, 79, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 119, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163]

cp's OEIS Frontend

A348748 Odd numbers k for which A064989(sigma(k)) < A064989(k), where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.

Table of values

List of values

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	15
7	17
8	19
9	21
10	23
11	27
12	29
13	31
14	33
15	35
16	37
17	39
18	41
19	43
20	47
21	51
22	53
23	55
24	57
25	59
26	61
27	63
28	65
29	67
30	69
31	71
32	73
33	77
34	79
35	83
36	85
37	87
38	89
39	91
40	93
41	95
42	97
43	99
44	101
45	103
46	105
47	107
48	109
49	111
50	113
51	115
52	119
53	123
54	125
55	127
56	129
57	131
58	133
59	135
60	137
61	139
62	141
63	143
64	145
65	147
66	149
67	151
68	153
69	155
70	157
71	159
72	161
73	163

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	15
7	17
8	19
9	21
10	23
11	27
12	29
13	31
14	33
15	35
16	37
17	39
18	41
19	43
20	47
21	51
22	53
23	55
24	57
25	59
26	61
27	63
28	65
29	67
30	69
31	71
32	73
33	77
34	79
35	83
36	85
37	87
38	89
39	91
40	93
41	95
42	97
43	99
44	101
45	103
46	105
47	107
48	109
49	111
50	113
51	115
52	119
53	123
54	125
55	127
56	129
57	131
58	133
59	135
60	137
61	139
62	141
63	143
64	145
65	147
66	149
67	151
68	153
69	155
70	157
71	159
72	161
73	163

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	15
7	17
8	19
9	21
10	23
11	27
12	29
13	31
14	33
15	35
16	37
17	39
18	41
19	43
20	47
21	51
22	53
23	55
24	57
25	59
26	61
27	63
28	65
29	67
30	69
31	71
32	73
33	77
34	79
35	83
36	85
37	87
38	89
39	91
40	93
41	95
42	97
43	99
44	101
45	103
46	105
47	107
48	109
49	111
50	113
51	115
52	119
53	123
54	125
55	127
56	129
57	131
58	133
59	135
60	137
61	139
62	141
63	143
64	145
65	147
66	149
67	151
68	153
69	155
70	157
71	159
72	161
73	163