A081339 - cp's OEIS frontend

A081339 Numbers n such that sigma(n^2) modulo 4 = 1.

n	a(n)
1	1
2	3
3	7
4	9
5	10
6	11
7	19
8	20
9	21
10	23
11	25
12	26
13	27
14	30
15	31
16	33
17	34
18	40
19	43
20	47
21	49
22	52
23	57
24	58
25	59
26	60
27	63
28	65
29	67
30	68
31	69
32	70
33	71
34	74
35	75
36	77
37	78
38	79
39	80
40	81
41	82
42	83
43	85
44	90
45	93
46	99
47	102
48	103
49	104
50	106
51	107
52	110
53	116
54	120
55	121
56	122
57	127
58	129
59	131
60	133
61	136
62	139
63	140
64	141
65	145

[1, 3, 7, 9, 10, 11, 19, 20, 21, 23, 25, 26, 27, 30, 31, 33, 34, 40, 43, 47, 49, 52, 57, 58, 59, 60, 63, 65, 67, 68, 69, 70, 71, 74, 75, 77, 78, 79, 80, 81, 82, 83, 85, 90, 93, 99, 102, 103, 104, 106, 107, 110, 116, 120, 121, 122, 127, 129, 131, 133, 136, 139, 140, 141, 145]

cp's OEIS Frontend

A081339 Numbers n such that sigma(n^2) modulo 4 = 1.

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	9
5	10
6	11
7	19
8	20
9	21
10	23
11	25
12	26
13	27
14	30
15	31
16	33
17	34
18	40
19	43
20	47
21	49
22	52
23	57
24	58
25	59
26	60
27	63
28	65
29	67
30	68
31	69
32	70
33	71
34	74
35	75
36	77
37	78
38	79
39	80
40	81
41	82
42	83
43	85
44	90
45	93
46	99
47	102
48	103
49	104
50	106
51	107
52	110
53	116
54	120
55	121
56	122
57	127
58	129
59	131
60	133
61	136
62	139
63	140
64	141
65	145

n	a(n)
1	1
2	3
3	7
4	9
5	10
6	11
7	19
8	20
9	21
10	23
11	25
12	26
13	27
14	30
15	31
16	33
17	34
18	40
19	43
20	47
21	49
22	52
23	57
24	58
25	59
26	60
27	63
28	65
29	67
30	68
31	69
32	70
33	71
34	74
35	75
36	77
37	78
38	79
39	80
40	81
41	82
42	83
43	85
44	90
45	93
46	99
47	102
48	103
49	104
50	106
51	107
52	110
53	116
54	120
55	121
56	122
57	127
58	129
59	131
60	133
61	136
62	139
63	140
64	141
65	145

n	a(n)
1	1
2	3
3	7
4	9
5	10
6	11
7	19
8	20
9	21
10	23
11	25
12	26
13	27
14	30
15	31
16	33
17	34
18	40
19	43
20	47
21	49
22	52
23	57
24	58
25	59
26	60
27	63
28	65
29	67
30	68
31	69
32	70
33	71
34	74
35	75
36	77
37	78
38	79
39	80
40	81
41	82
42	83
43	85
44	90
45	93
46	99
47	102
48	103
49	104
50	106
51	107
52	110
53	116
54	120
55	121
56	122
57	127
58	129
59	131
60	133
61	136
62	139
63	140
64	141
65	145