A117206 - cp's OEIS frontend

A117206 Squarefree positive integers k such that 2*k-1 is also squarefree.

n	a(n)
1	1
2	2
3	3
4	6
5	7
6	10
7	11
8	15
9	17
10	19
11	21
12	22
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	42
23	43
24	46
25	47
26	51
27	53
28	55
29	57
30	58
31	62
32	65
33	66
34	67
35	69
36	70
37	71
38	73
39	78
40	79
41	82
42	83
43	87
44	89
45	91
46	93
47	94
48	97
49	101
50	102
51	103
52	105
53	106
54	107
55	109
56	110
57	111
58	114
59	115
60	118
61	119
62	127
63	129
64	130
65	133

[1, 2, 3, 6, 7, 10, 11, 15, 17, 19, 21, 22, 26, 29, 30, 31, 33, 34, 35, 37, 39, 42, 43, 46, 47, 51, 53, 55, 57, 58, 62, 65, 66, 67, 69, 70, 71, 73, 78, 79, 82, 83, 87, 89, 91, 93, 94, 97, 101, 102, 103, 105, 106, 107, 109, 110, 111, 114, 115, 118, 119, 127, 129, 130, 133]

cp's OEIS Frontend

A117206 Squarefree positive integers k such that 2*k-1 is also squarefree.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	6
5	7
6	10
7	11
8	15
9	17
10	19
11	21
12	22
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	42
23	43
24	46
25	47
26	51
27	53
28	55
29	57
30	58
31	62
32	65
33	66
34	67
35	69
36	70
37	71
38	73
39	78
40	79
41	82
42	83
43	87
44	89
45	91
46	93
47	94
48	97
49	101
50	102
51	103
52	105
53	106
54	107
55	109
56	110
57	111
58	114
59	115
60	118
61	119
62	127
63	129
64	130
65	133

n	a(n)
1	1
2	2
3	3
4	6
5	7
6	10
7	11
8	15
9	17
10	19
11	21
12	22
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	42
23	43
24	46
25	47
26	51
27	53
28	55
29	57
30	58
31	62
32	65
33	66
34	67
35	69
36	70
37	71
38	73
39	78
40	79
41	82
42	83
43	87
44	89
45	91
46	93
47	94
48	97
49	101
50	102
51	103
52	105
53	106
54	107
55	109
56	110
57	111
58	114
59	115
60	118
61	119
62	127
63	129
64	130
65	133

n	a(n)
1	1
2	2
3	3
4	6
5	7
6	10
7	11
8	15
9	17
10	19
11	21
12	22
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	42
23	43
24	46
25	47
26	51
27	53
28	55
29	57
30	58
31	62
32	65
33	66
34	67
35	69
36	70
37	71
38	73
39	78
40	79
41	82
42	83
43	87
44	89
45	91
46	93
47	94
48	97
49	101
50	102
51	103
52	105
53	106
54	107
55	109
56	110
57	111
58	114
59	115
60	118
61	119
62	127
63	129
64	130
65	133