A045745 - cp's OEIS frontend

A045745 Numbers n such that sum of proper divisors s(n) is a triangular number T(k).

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	11
9	13
10	14
11	16
12	17
13	18
14	19
15	23
16	24
17	25
18	28
19	29
20	31
21	33
22	36
23	37
24	41
25	43
26	47
27	51
28	53
29	54
30	59
31	61
32	66
33	67
34	71
35	73
36	79
37	83
38	89
39	91
40	97
41	101
42	103
43	107
44	109
45	112
46	113
47	123
48	127
49	131
50	135
51	137
52	139
53	149
54	151
55	157
56	163
57	167
58	172
59	173
60	179
61	181
62	191
63	193

[1, 2, 3, 4, 5, 6, 7, 11, 13, 14, 16, 17, 18, 19, 23, 24, 25, 28, 29, 31, 33, 36, 37, 41, 43, 47, 51, 53, 54, 59, 61, 66, 67, 71, 73, 79, 83, 89, 91, 97, 101, 103, 107, 109, 112, 113, 123, 127, 131, 135, 137, 139, 149, 151, 157, 163, 167, 172, 173, 179, 181, 191, 193]

cp's OEIS Frontend

A045745 Numbers n such that sum of proper divisors s(n) is a triangular number T(k).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	11
9	13
10	14
11	16
12	17
13	18
14	19
15	23
16	24
17	25
18	28
19	29
20	31
21	33
22	36
23	37
24	41
25	43
26	47
27	51
28	53
29	54
30	59
31	61
32	66
33	67
34	71
35	73
36	79
37	83
38	89
39	91
40	97
41	101
42	103
43	107
44	109
45	112
46	113
47	123
48	127
49	131
50	135
51	137
52	139
53	149
54	151
55	157
56	163
57	167
58	172
59	173
60	179
61	181
62	191
63	193

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	11
9	13
10	14
11	16
12	17
13	18
14	19
15	23
16	24
17	25
18	28
19	29
20	31
21	33
22	36
23	37
24	41
25	43
26	47
27	51
28	53
29	54
30	59
31	61
32	66
33	67
34	71
35	73
36	79
37	83
38	89
39	91
40	97
41	101
42	103
43	107
44	109
45	112
46	113
47	123
48	127
49	131
50	135
51	137
52	139
53	149
54	151
55	157
56	163
57	167
58	172
59	173
60	179
61	181
62	191
63	193

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	11
9	13
10	14
11	16
12	17
13	18
14	19
15	23
16	24
17	25
18	28
19	29
20	31
21	33
22	36
23	37
24	41
25	43
26	47
27	51
28	53
29	54
30	59
31	61
32	66
33	67
34	71
35	73
36	79
37	83
38	89
39	91
40	97
41	101
42	103
43	107
44	109
45	112
46	113
47	123
48	127
49	131
50	135
51	137
52	139
53	149
54	151
55	157
56	163
57	167
58	172
59	173
60	179
61	181
62	191
63	193