A293430 - cp's OEIS frontend

A293430 Persistently squarefree numbers for base-2 shifting: Numbers n such that all terms in finite set [n, floor(n/2), floor(n/4), floor(n/8), ..., 1] are squarefree.

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	13
10	14
11	15
12	21
13	22
14	23
15	26
16	29
17	30
18	31
19	42
20	43
21	46
22	47
23	53
24	58
25	59
26	61
27	62
28	85
29	86
30	87
31	93
32	94
33	95
34	106
35	107
36	118
37	119
38	122
39	123
40	170
41	173
42	174
43	186
44	187
45	190
46	191
47	213
48	214
49	215
50	237
51	238
52	239
53	246
54	247
55	341
56	346
57	347
58	349
59	373
60	374
61	381
62	382
63	383
64	426
65	427
66	429
67	430
68	431
69	474
70	478
71	479

[1, 2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 21, 22, 23, 26, 29, 30, 31, 42, 43, 46, 47, 53, 58, 59, 61, 62, 85, 86, 87, 93, 94, 95, 106, 107, 118, 119, 122, 123, 170, 173, 174, 186, 187, 190, 191, 213, 214, 215, 237, 238, 239, 246, 247, 341, 346, 347, 349, 373, 374, 381, 382, 383, 426, 427, 429, 430, 431, 474, 478, 479]

cp's OEIS Frontend

A293430 Persistently squarefree numbers for base-2 shifting: Numbers n such that all terms in finite set [n, floor(n/2), floor(n/4), floor(n/8), ..., 1] 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	13
10	14
11	15
12	21
13	22
14	23
15	26
16	29
17	30
18	31
19	42
20	43
21	46
22	47
23	53
24	58
25	59
26	61
27	62
28	85
29	86
30	87
31	93
32	94
33	95
34	106
35	107
36	118
37	119
38	122
39	123
40	170
41	173
42	174
43	186
44	187
45	190
46	191
47	213
48	214
49	215
50	237
51	238
52	239
53	246
54	247
55	341
56	346
57	347
58	349
59	373
60	374
61	381
62	382
63	383
64	426
65	427
66	429
67	430
68	431
69	474
70	478
71	479

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	13
10	14
11	15
12	21
13	22
14	23
15	26
16	29
17	30
18	31
19	42
20	43
21	46
22	47
23	53
24	58
25	59
26	61
27	62
28	85
29	86
30	87
31	93
32	94
33	95
34	106
35	107
36	118
37	119
38	122
39	123
40	170
41	173
42	174
43	186
44	187
45	190
46	191
47	213
48	214
49	215
50	237
51	238
52	239
53	246
54	247
55	341
56	346
57	347
58	349
59	373
60	374
61	381
62	382
63	383
64	426
65	427
66	429
67	430
68	431
69	474
70	478
71	479

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	10
8	11
9	13
10	14
11	15
12	21
13	22
14	23
15	26
16	29
17	30
18	31
19	42
20	43
21	46
22	47
23	53
24	58
25	59
26	61
27	62
28	85
29	86
30	87
31	93
32	94
33	95
34	106
35	107
36	118
37	119
38	122
39	123
40	170
41	173
42	174
43	186
44	187
45	190
46	191
47	213
48	214
49	215
50	237
51	238
52	239
53	246
54	247
55	341
56	346
57	347
58	349
59	373
60	374
61	381
62	382
63	383
64	426
65	427
66	429
67	430
68	431
69	474
70	478
71	479