A008912 - cp's OEIS frontend

A008912 Truncated triangular numbers (of form n(n-3)/2 - k^2+kn+1 for 1<=k

n	a(n)
1	1
2	3
3	6
4	7
5	10
6	12
7	15
8	18
9	19
10	21
11	25
12	27
13	28
14	33
15	36
16	37
17	42
18	45
19	46
20	48
21	52
22	55
23	57
24	60
25	61
26	63
27	66
28	69
29	73
30	75
31	78
32	82
33	87
34	88
35	90
36	91
37	96
38	102
39	105
40	106
41	108
42	111
43	117
44	118
45	120
46	123
47	126
48	127
49	133
50	135
51	136
52	141
53	144
54	145
55	147
56	150
57	153
58	160
59	162
60	165

[1, 3, 6, 7, 10, 12, 15, 18, 19, 21, 25, 27, 28, 33, 36, 37, 42, 45, 46, 48, 52, 55, 57, 60, 61, 63, 66, 69, 73, 75, 78, 82, 87, 88, 90, 91, 96, 102, 105, 106, 108, 111, 117, 118, 120, 123, 126, 127, 133, 135, 136, 141, 144, 145, 147, 150, 153, 160, 162, 165]

cp's OEIS Frontend

A008912 Truncated triangular numbers (of form n(n-3)/2 - k^2+kn+1 for 1<=k

Table of values

List of values

n	a(n)
1	1
2	3
3	6
4	7
5	10
6	12
7	15
8	18
9	19
10	21
11	25
12	27
13	28
14	33
15	36
16	37
17	42
18	45
19	46
20	48
21	52
22	55
23	57
24	60
25	61
26	63
27	66
28	69
29	73
30	75
31	78
32	82
33	87
34	88
35	90
36	91
37	96
38	102
39	105
40	106
41	108
42	111
43	117
44	118
45	120
46	123
47	126
48	127
49	133
50	135
51	136
52	141
53	144
54	145
55	147
56	150
57	153
58	160
59	162
60	165

n	a(n)
1	1
2	3
3	6
4	7
5	10
6	12
7	15
8	18
9	19
10	21
11	25
12	27
13	28
14	33
15	36
16	37
17	42
18	45
19	46
20	48
21	52
22	55
23	57
24	60
25	61
26	63
27	66
28	69
29	73
30	75
31	78
32	82
33	87
34	88
35	90
36	91
37	96
38	102
39	105
40	106
41	108
42	111
43	117
44	118
45	120
46	123
47	126
48	127
49	133
50	135
51	136
52	141
53	144
54	145
55	147
56	150
57	153
58	160
59	162
60	165

cp's OEIS Frontend

A008912 Truncated triangular numbers (of form n*(n-3)/2 - k^2+k*n+1 for 1<=k

Table of values

List of values

A008912 Truncated triangular numbers (of form n(n-3)/2 - k^2+kn+1 for 1<=k

n	a(n)
1	1
2	3
3	6
4	7
5	10
6	12
7	15
8	18
9	19
10	21
11	25
12	27
13	28
14	33
15	36
16	37
17	42
18	45
19	46
20	48
21	52
22	55
23	57
24	60
25	61
26	63
27	66
28	69
29	73
30	75
31	78
32	82
33	87
34	88
35	90
36	91
37	96
38	102
39	105
40	106
41	108
42	111
43	117
44	118
45	120
46	123
47	126
48	127
49	133
50	135
51	136
52	141
53	144
54	145
55	147
56	150
57	153
58	160
59	162
60	165