A348753 - cp's OEIS frontend

A348753 Numbers k congruent to 1 or 5 mod 6, for which A064989(A064989(sigma(k))) < A064989(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	5
2	7
3	11
4	13
5	17
6	19
7	23
8	29
9	31
10	35
11	37
12	41
13	43
14	47
15	53
16	55
17	59
18	61
19	65
20	67
21	71
22	73
23	77
24	79
25	83
26	85
27	89
28	91
29	95
30	97
31	101
32	103
33	107
34	109
35	113
36	115
37	119
38	125
39	127
40	131
41	133
42	137
43	139
44	143
45	145
46	149
47	151
48	155
49	157
50	161
51	163
52	167
53	173
54	179
55	181
56	185
57	187
58	191
59	193
60	197
61	199
62	203
63	205
64	209
65	211
66	215
67	217
68	221
69	223
70	227

[5, 7, 11, 13, 17, 19, 23, 29, 31, 35, 37, 41, 43, 47, 53, 55, 59, 61, 65, 67, 71, 73, 77, 79, 83, 85, 89, 91, 95, 97, 101, 103, 107, 109, 113, 115, 119, 125, 127, 131, 133, 137, 139, 143, 145, 149, 151, 155, 157, 161, 163, 167, 173, 179, 181, 185, 187, 191, 193, 197, 199, 203, 205, 209, 211, 215, 217, 221, 223, 227]

cp's OEIS Frontend

A348753 Numbers k congruent to 1 or 5 mod 6, for which A064989(A064989(sigma(k))) < A064989(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	5
2	7
3	11
4	13
5	17
6	19
7	23
8	29
9	31
10	35
11	37
12	41
13	43
14	47
15	53
16	55
17	59
18	61
19	65
20	67
21	71
22	73
23	77
24	79
25	83
26	85
27	89
28	91
29	95
30	97
31	101
32	103
33	107
34	109
35	113
36	115
37	119
38	125
39	127
40	131
41	133
42	137
43	139
44	143
45	145
46	149
47	151
48	155
49	157
50	161
51	163
52	167
53	173
54	179
55	181
56	185
57	187
58	191
59	193
60	197
61	199
62	203
63	205
64	209
65	211
66	215
67	217
68	221
69	223
70	227

n	a(n)
1	5
2	7
3	11
4	13
5	17
6	19
7	23
8	29
9	31
10	35
11	37
12	41
13	43
14	47
15	53
16	55
17	59
18	61
19	65
20	67
21	71
22	73
23	77
24	79
25	83
26	85
27	89
28	91
29	95
30	97
31	101
32	103
33	107
34	109
35	113
36	115
37	119
38	125
39	127
40	131
41	133
42	137
43	139
44	143
45	145
46	149
47	151
48	155
49	157
50	161
51	163
52	167
53	173
54	179
55	181
56	185
57	187
58	191
59	193
60	197
61	199
62	203
63	205
64	209
65	211
66	215
67	217
68	221
69	223
70	227

n	a(n)
1	5
2	7
3	11
4	13
5	17
6	19
7	23
8	29
9	31
10	35
11	37
12	41
13	43
14	47
15	53
16	55
17	59
18	61
19	65
20	67
21	71
22	73
23	77
24	79
25	83
26	85
27	89
28	91
29	95
30	97
31	101
32	103
33	107
34	109
35	113
36	115
37	119
38	125
39	127
40	131
41	133
42	137
43	139
44	143
45	145
46	149
47	151
48	155
49	157
50	161
51	163
52	167
53	173
54	179
55	181
56	185
57	187
58	191
59	193
60	197
61	199
62	203
63	205
64	209
65	211
66	215
67	217
68	221
69	223
70	227