A185978 - cp's OEIS frontend

A185978 Nontriangular numbers which are the sum of two (positive) triangular numbers.

n	a(n)
1	2
2	4
3	7
4	9
5	11
6	12
7	13
8	16
9	18
10	20
11	22
12	24
13	25
14	27
15	29
16	30
17	31
18	34
19	37
20	38
21	39
22	42
23	43
24	46
25	48
26	49
27	51
28	56
29	57
30	58
31	60
32	61
33	64
34	65
35	67
36	69
37	70
38	72
39	73
40	76
41	79
42	81
43	83
44	84
45	87
46	88
47	90
48	92
49	93
50	94
51	97
52	99
53	100
54	101
55	102
56	106
57	108

[2, 4, 7, 9, 11, 12, 13, 16, 18, 20, 22, 24, 25, 27, 29, 30, 31, 34, 37, 38, 39, 42, 43, 46, 48, 49, 51, 56, 57, 58, 60, 61, 64, 65, 67, 69, 70, 72, 73, 76, 79, 81, 83, 84, 87, 88, 90, 92, 93, 94, 97, 99, 100, 101, 102, 106, 108]

cp's OEIS Frontend

A185978 Nontriangular numbers which are the sum of two (positive) triangular numbers.

Table of values

List of values

n	a(n)
1	2
2	4
3	7
4	9
5	11
6	12
7	13
8	16
9	18
10	20
11	22
12	24
13	25
14	27
15	29
16	30
17	31
18	34
19	37
20	38
21	39
22	42
23	43
24	46
25	48
26	49
27	51
28	56
29	57
30	58
31	60
32	61
33	64
34	65
35	67
36	69
37	70
38	72
39	73
40	76
41	79
42	81
43	83
44	84
45	87
46	88
47	90
48	92
49	93
50	94
51	97
52	99
53	100
54	101
55	102
56	106
57	108

n	a(n)
1	2
2	4
3	7
4	9
5	11
6	12
7	13
8	16
9	18
10	20
11	22
12	24
13	25
14	27
15	29
16	30
17	31
18	34
19	37
20	38
21	39
22	42
23	43
24	46
25	48
26	49
27	51
28	56
29	57
30	58
31	60
32	61
33	64
34	65
35	67
36	69
37	70
38	72
39	73
40	76
41	79
42	81
43	83
44	84
45	87
46	88
47	90
48	92
49	93
50	94
51	97
52	99
53	100
54	101
55	102
56	106
57	108

n	a(n)
1	2
2	4
3	7
4	9
5	11
6	12
7	13
8	16
9	18
10	20
11	22
12	24
13	25
14	27
15	29
16	30
17	31
18	34
19	37
20	38
21	39
22	42
23	43
24	46
25	48
26	49
27	51
28	56
29	57
30	58
31	60
32	61
33	64
34	65
35	67
36	69
37	70
38	72
39	73
40	76
41	79
42	81
43	83
44	84
45	87
46	88
47	90
48	92
49	93
50	94
51	97
52	99
53	100
54	101
55	102
56	106
57	108