A230060 - cp's OEIS frontend

A230060 Numbers k such that the distance from k^2 to the smallest triangular number >= k^2 is itself triangular.

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	15
9	18
10	20
11	28
12	30
13	35
14	42
15	45
16	54
17	60
18	63
19	66
20	77
21	78
22	88
23	90
24	102
25	105
26	114
27	117
28	126
29	130
30	138
31	150
32	162
33	165
34	174
35	175
36	186
37	198
38	204
39	210
40	221
41	222
42	234
43	245
44	246
45	247
46	258
47	264
48	266
49	270
50	282
51	294
52	306
53	315
54	318
55	330
56	342
57	351
58	354
59	366
60	368
61	378
62	385
63	390

[1, 3, 5, 6, 7, 9, 11, 15, 18, 20, 28, 30, 35, 42, 45, 54, 60, 63, 66, 77, 78, 88, 90, 102, 105, 114, 117, 126, 130, 138, 150, 162, 165, 174, 175, 186, 198, 204, 210, 221, 222, 234, 245, 246, 247, 258, 264, 266, 270, 282, 294, 306, 315, 318, 330, 342, 351, 354, 366, 368, 378, 385, 390]

cp's OEIS Frontend

A230060 Numbers k such that the distance from k^2 to the smallest triangular number >= k^2 is itself triangular.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	15
9	18
10	20
11	28
12	30
13	35
14	42
15	45
16	54
17	60
18	63
19	66
20	77
21	78
22	88
23	90
24	102
25	105
26	114
27	117
28	126
29	130
30	138
31	150
32	162
33	165
34	174
35	175
36	186
37	198
38	204
39	210
40	221
41	222
42	234
43	245
44	246
45	247
46	258
47	264
48	266
49	270
50	282
51	294
52	306
53	315
54	318
55	330
56	342
57	351
58	354
59	366
60	368
61	378
62	385
63	390

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	15
9	18
10	20
11	28
12	30
13	35
14	42
15	45
16	54
17	60
18	63
19	66
20	77
21	78
22	88
23	90
24	102
25	105
26	114
27	117
28	126
29	130
30	138
31	150
32	162
33	165
34	174
35	175
36	186
37	198
38	204
39	210
40	221
41	222
42	234
43	245
44	246
45	247
46	258
47	264
48	266
49	270
50	282
51	294
52	306
53	315
54	318
55	330
56	342
57	351
58	354
59	366
60	368
61	378
62	385
63	390

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	15
9	18
10	20
11	28
12	30
13	35
14	42
15	45
16	54
17	60
18	63
19	66
20	77
21	78
22	88
23	90
24	102
25	105
26	114
27	117
28	126
29	130
30	138
31	150
32	162
33	165
34	174
35	175
36	186
37	198
38	204
39	210
40	221
41	222
42	234
43	245
44	246
45	247
46	258
47	264
48	266
49	270
50	282
51	294
52	306
53	315
54	318
55	330
56	342
57	351
58	354
59	366
60	368
61	378
62	385
63	390