A293523 - cp's OEIS frontend

A293523 Persistently squarefree numbers for base-3 shifting: Numbers n such that all terms in finite set of positive numbers [n, floor(n/3), floor(n/9), floor(n/27), ..., floor(n/3^k)>0] are squarefree.

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	15
10	17
11	19
12	21
13	22
14	23
15	30
16	31
17	33
18	34
19	35
20	46
21	47
22	51
23	53
24	57
25	58
26	59
27	65
28	66
29	67
30	69
31	70
32	71
33	91
34	93
35	94
36	95
37	101
38	102
39	103
40	105
41	106
42	107
43	138
44	139
45	141
46	142
47	143
48	154
49	155
50	159
51	161
52	173
53	174
54	177
55	178
56	179
57	195
58	197
59	199
60	201
61	202
62	203
63	209
64	210
65	211
66	213
67	214
68	215
69	273
70	274
71	281
72	282

[1, 2, 3, 5, 6, 7, 10, 11, 15, 17, 19, 21, 22, 23, 30, 31, 33, 34, 35, 46, 47, 51, 53, 57, 58, 59, 65, 66, 67, 69, 70, 71, 91, 93, 94, 95, 101, 102, 103, 105, 106, 107, 138, 139, 141, 142, 143, 154, 155, 159, 161, 173, 174, 177, 178, 179, 195, 197, 199, 201, 202, 203, 209, 210, 211, 213, 214, 215, 273, 274, 281, 282]

cp's OEIS Frontend

A293523 Persistently squarefree numbers for base-3 shifting: Numbers n such that all terms in finite set of positive numbers [n, floor(n/3), floor(n/9), floor(n/27), ..., floor(n/3^k)>0] are squarefree.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	15
10	17
11	19
12	21
13	22
14	23
15	30
16	31
17	33
18	34
19	35
20	46
21	47
22	51
23	53
24	57
25	58
26	59
27	65
28	66
29	67
30	69
31	70
32	71
33	91
34	93
35	94
36	95
37	101
38	102
39	103
40	105
41	106
42	107
43	138
44	139
45	141
46	142
47	143
48	154
49	155
50	159
51	161
52	173
53	174
54	177
55	178
56	179
57	195
58	197
59	199
60	201
61	202
62	203
63	209
64	210
65	211
66	213
67	214
68	215
69	273
70	274
71	281
72	282

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	15
10	17
11	19
12	21
13	22
14	23
15	30
16	31
17	33
18	34
19	35
20	46
21	47
22	51
23	53
24	57
25	58
26	59
27	65
28	66
29	67
30	69
31	70
32	71
33	91
34	93
35	94
36	95
37	101
38	102
39	103
40	105
41	106
42	107
43	138
44	139
45	141
46	142
47	143
48	154
49	155
50	159
51	161
52	173
53	174
54	177
55	178
56	179
57	195
58	197
59	199
60	201
61	202
62	203
63	209
64	210
65	211
66	213
67	214
68	215
69	273
70	274
71	281
72	282

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	15
10	17
11	19
12	21
13	22
14	23
15	30
16	31
17	33
18	34
19	35
20	46
21	47
22	51
23	53
24	57
25	58
26	59
27	65
28	66
29	67
30	69
31	70
32	71
33	91
34	93
35	94
36	95
37	101
38	102
39	103
40	105
41	106
42	107
43	138
44	139
45	141
46	142
47	143
48	154
49	155
50	159
51	161
52	173
53	174
54	177
55	178
56	179
57	195
58	197
59	199
60	201
61	202
62	203
63	209
64	210
65	211
66	213
67	214
68	215
69	273
70	274
71	281
72	282