A088609 - cp's OEIS frontend

A088609 a(1) = 1, a(n) is the smallest squarefree number not included earlier if n is not squarefree, else n is the smallest nonsquarefree number.

n	a(n)
1	1
2	4
3	8
4	2
5	9
6	12
7	16
8	3
9	5
10	18
11	20
12	6
13	24
14	25
15	27
16	7
17	28
18	10
19	32
20	11
21	36
22	40
23	44
24	13
25	14
26	45
27	15
28	17
29	48
30	49
31	50
32	19
33	52
34	54
35	56
36	21
37	60
38	63
39	64
40	22
41	68
42	72
43	75
44	23
45	26
46	76
47	80
48	29
49	30
50	31
51	81
52	33
53	84
54	34
55	88
56	35
57	90
58	92
59	96
60	37
61	98
62	99
63	38
64	39
65	100
66	104
67	108
68	41
69	112
70	116

[1, 4, 8, 2, 9, 12, 16, 3, 5, 18, 20, 6, 24, 25, 27, 7, 28, 10, 32, 11, 36, 40, 44, 13, 14, 45, 15, 17, 48, 49, 50, 19, 52, 54, 56, 21, 60, 63, 64, 22, 68, 72, 75, 23, 26, 76, 80, 29, 30, 31, 81, 33, 84, 34, 88, 35, 90, 92, 96, 37, 98, 99, 38, 39, 100, 104, 108, 41, 112, 116]

cp's OEIS Frontend

A088609 a(1) = 1, a(n) is the smallest squarefree number not included earlier if n is not squarefree, else n is the smallest nonsquarefree number.

Table of values

List of values

n	a(n)
1	1
2	4
3	8
4	2
5	9
6	12
7	16
8	3
9	5
10	18
11	20
12	6
13	24
14	25
15	27
16	7
17	28
18	10
19	32
20	11
21	36
22	40
23	44
24	13
25	14
26	45
27	15
28	17
29	48
30	49
31	50
32	19
33	52
34	54
35	56
36	21
37	60
38	63
39	64
40	22
41	68
42	72
43	75
44	23
45	26
46	76
47	80
48	29
49	30
50	31
51	81
52	33
53	84
54	34
55	88
56	35
57	90
58	92
59	96
60	37
61	98
62	99
63	38
64	39
65	100
66	104
67	108
68	41
69	112
70	116

n	a(n)
1	1
2	4
3	8
4	2
5	9
6	12
7	16
8	3
9	5
10	18
11	20
12	6
13	24
14	25
15	27
16	7
17	28
18	10
19	32
20	11
21	36
22	40
23	44
24	13
25	14
26	45
27	15
28	17
29	48
30	49
31	50
32	19
33	52
34	54
35	56
36	21
37	60
38	63
39	64
40	22
41	68
42	72
43	75
44	23
45	26
46	76
47	80
48	29
49	30
50	31
51	81
52	33
53	84
54	34
55	88
56	35
57	90
58	92
59	96
60	37
61	98
62	99
63	38
64	39
65	100
66	104
67	108
68	41
69	112
70	116

n	a(n)
1	1
2	4
3	8
4	2
5	9
6	12
7	16
8	3
9	5
10	18
11	20
12	6
13	24
14	25
15	27
16	7
17	28
18	10
19	32
20	11
21	36
22	40
23	44
24	13
25	14
26	45
27	15
28	17
29	48
30	49
31	50
32	19
33	52
34	54
35	56
36	21
37	60
38	63
39	64
40	22
41	68
42	72
43	75
44	23
45	26
46	76
47	80
48	29
49	30
50	31
51	81
52	33
53	84
54	34
55	88
56	35
57	90
58	92
59	96
60	37
61	98
62	99
63	38
64	39
65	100
66	104
67	108
68	41
69	112
70	116