A339907 - cp's OEIS frontend

A339907 Odd squarefree numbers k > 1 for which the bigomega(phi(k)) <= bigomega(k-1), where bigomega gives the number of prime divisors, counted with multiplicity.

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	17
7	19
8	21
9	23
10	29
11	31
12	33
13	37
14	41
15	43
16	47
17	53
18	55
19	57
20	59
21	61
22	65
23	67
24	69
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	129
38	131
39	137
40	139
41	141
42	145
43	149
44	151
45	157
46	161
47	163
48	167
49	173
50	177
51	179
52	181
53	191
54	193
55	197
56	199
57	201
58	209
59	211
60	217
61	223
62	227
63	229
64	233
65	235
66	239
67	241
68	249
69	251
70	253
71	257

[3, 5, 7, 11, 13, 17, 19, 21, 23, 29, 31, 33, 37, 41, 43, 47, 53, 55, 57, 59, 61, 65, 67, 69, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 129, 131, 137, 139, 141, 145, 149, 151, 157, 161, 163, 167, 173, 177, 179, 181, 191, 193, 197, 199, 201, 209, 211, 217, 223, 227, 229, 233, 235, 239, 241, 249, 251, 253, 257]

cp's OEIS Frontend

A339907 Odd squarefree numbers k > 1 for which the bigomega(phi(k)) <= bigomega(k-1), where bigomega gives the number of prime divisors, counted with multiplicity.

Table of values

List of values

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	17
7	19
8	21
9	23
10	29
11	31
12	33
13	37
14	41
15	43
16	47
17	53
18	55
19	57
20	59
21	61
22	65
23	67
24	69
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	129
38	131
39	137
40	139
41	141
42	145
43	149
44	151
45	157
46	161
47	163
48	167
49	173
50	177
51	179
52	181
53	191
54	193
55	197
56	199
57	201
58	209
59	211
60	217
61	223
62	227
63	229
64	233
65	235
66	239
67	241
68	249
69	251
70	253
71	257

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	17
7	19
8	21
9	23
10	29
11	31
12	33
13	37
14	41
15	43
16	47
17	53
18	55
19	57
20	59
21	61
22	65
23	67
24	69
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	129
38	131
39	137
40	139
41	141
42	145
43	149
44	151
45	157
46	161
47	163
48	167
49	173
50	177
51	179
52	181
53	191
54	193
55	197
56	199
57	201
58	209
59	211
60	217
61	223
62	227
63	229
64	233
65	235
66	239
67	241
68	249
69	251
70	253
71	257

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	17
7	19
8	21
9	23
10	29
11	31
12	33
13	37
14	41
15	43
16	47
17	53
18	55
19	57
20	59
21	61
22	65
23	67
24	69
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	129
38	131
39	137
40	139
41	141
42	145
43	149
44	151
45	157
46	161
47	163
48	167
49	173
50	177
51	179
52	181
53	191
54	193
55	197
56	199
57	201
58	209
59	211
60	217
61	223
62	227
63	229
64	233
65	235
66	239
67	241
68	249
69	251
70	253
71	257