A175428 - cp's OEIS frontend

A175428 a(n) is the smallest positive integer such that a(n)+a(n-1) is a cube and a(n) is not in {a(1), ..., a(n-1)}.

n	a(n)
1	1
2	7
3	20
4	44
5	81
6	135
7	208
8	8
9	19
10	45
11	80
12	136
13	207
14	9
15	18
16	46
17	79
18	137
19	206
20	10
21	17
22	47
23	78
24	138
25	205
26	11
27	16
28	48
29	77
30	139
31	204
32	12
33	15
34	49
35	76
36	140
37	203
38	13
39	14
40	50
41	75
42	141
43	202
44	310
45	33
46	31
47	94
48	122
49	3
50	5
51	22
52	42
53	83
54	133
55	210
56	6
57	2
58	25
59	39
60	86
61	130
62	213
63	299
64	430
65	82

[1, 7, 20, 44, 81, 135, 208, 8, 19, 45, 80, 136, 207, 9, 18, 46, 79, 137, 206, 10, 17, 47, 78, 138, 205, 11, 16, 48, 77, 139, 204, 12, 15, 49, 76, 140, 203, 13, 14, 50, 75, 141, 202, 310, 33, 31, 94, 122, 3, 5, 22, 42, 83, 133, 210, 6, 2, 25, 39, 86, 130, 213, 299, 430, 82]

cp's OEIS Frontend

A175428 a(n) is the smallest positive integer such that a(n)+a(n-1) is a cube and a(n) is not in {a(1), ..., a(n-1)}.

Table of values

List of values

n	a(n)
1	1
2	7
3	20
4	44
5	81
6	135
7	208
8	8
9	19
10	45
11	80
12	136
13	207
14	9
15	18
16	46
17	79
18	137
19	206
20	10
21	17
22	47
23	78
24	138
25	205
26	11
27	16
28	48
29	77
30	139
31	204
32	12
33	15
34	49
35	76
36	140
37	203
38	13
39	14
40	50
41	75
42	141
43	202
44	310
45	33
46	31
47	94
48	122
49	3
50	5
51	22
52	42
53	83
54	133
55	210
56	6
57	2
58	25
59	39
60	86
61	130
62	213
63	299
64	430
65	82

n	a(n)
1	1
2	7
3	20
4	44
5	81
6	135
7	208
8	8
9	19
10	45
11	80
12	136
13	207
14	9
15	18
16	46
17	79
18	137
19	206
20	10
21	17
22	47
23	78
24	138
25	205
26	11
27	16
28	48
29	77
30	139
31	204
32	12
33	15
34	49
35	76
36	140
37	203
38	13
39	14
40	50
41	75
42	141
43	202
44	310
45	33
46	31
47	94
48	122
49	3
50	5
51	22
52	42
53	83
54	133
55	210
56	6
57	2
58	25
59	39
60	86
61	130
62	213
63	299
64	430
65	82

n	a(n)
1	1
2	7
3	20
4	44
5	81
6	135
7	208
8	8
9	19
10	45
11	80
12	136
13	207
14	9
15	18
16	46
17	79
18	137
19	206
20	10
21	17
22	47
23	78
24	138
25	205
26	11
27	16
28	48
29	77
30	139
31	204
32	12
33	15
34	49
35	76
36	140
37	203
38	13
39	14
40	50
41	75
42	141
43	202
44	310
45	33
46	31
47	94
48	122
49	3
50	5
51	22
52	42
53	83
54	133
55	210
56	6
57	2
58	25
59	39
60	86
61	130
62	213
63	299
64	430
65	82