A259429 - cp's OEIS frontend

A259429 With a(1) = 1, a(n) is the smallest number not already in the sequence such that the arithmetic mean of two neighboring terms is a cube.

n	a(n)
1	1
2	15
3	39
4	89
5	161
6	271
7	415
8	17
9	37
10	91
11	159
12	273
13	413
14	19
15	35
16	93
17	157
18	275
19	411
20	21
21	33
22	95
23	155
24	277
25	409
26	23
27	31
28	97
29	153
30	279
31	407
32	25
33	29
34	99
35	151
36	281
37	405
38	27
39	101
40	149
41	283
42	403
43	621
44	65
45	63
46	187
47	245
48	5
49	11
50	43
51	85
52	165
53	267
54	419
55	13
56	3
57	51
58	77
59	173
60	259
61	427
62	597
63	861
64	163
65	87
66	41
67	209
68	223
69	463
70	561
71	125

[1, 15, 39, 89, 161, 271, 415, 17, 37, 91, 159, 273, 413, 19, 35, 93, 157, 275, 411, 21, 33, 95, 155, 277, 409, 23, 31, 97, 153, 279, 407, 25, 29, 99, 151, 281, 405, 27, 101, 149, 283, 403, 621, 65, 63, 187, 245, 5, 11, 43, 85, 165, 267, 419, 13, 3, 51, 77, 173, 259, 427, 597, 861, 163, 87, 41, 209, 223, 463, 561, 125]

cp's OEIS Frontend

A259429 With a(1) = 1, a(n) is the smallest number not already in the sequence such that the arithmetic mean of two neighboring terms is a cube.

Table of values

List of values

n	a(n)
1	1
2	15
3	39
4	89
5	161
6	271
7	415
8	17
9	37
10	91
11	159
12	273
13	413
14	19
15	35
16	93
17	157
18	275
19	411
20	21
21	33
22	95
23	155
24	277
25	409
26	23
27	31
28	97
29	153
30	279
31	407
32	25
33	29
34	99
35	151
36	281
37	405
38	27
39	101
40	149
41	283
42	403
43	621
44	65
45	63
46	187
47	245
48	5
49	11
50	43
51	85
52	165
53	267
54	419
55	13
56	3
57	51
58	77
59	173
60	259
61	427
62	597
63	861
64	163
65	87
66	41
67	209
68	223
69	463
70	561
71	125

n	a(n)
1	1
2	15
3	39
4	89
5	161
6	271
7	415
8	17
9	37
10	91
11	159
12	273
13	413
14	19
15	35
16	93
17	157
18	275
19	411
20	21
21	33
22	95
23	155
24	277
25	409
26	23
27	31
28	97
29	153
30	279
31	407
32	25
33	29
34	99
35	151
36	281
37	405
38	27
39	101
40	149
41	283
42	403
43	621
44	65
45	63
46	187
47	245
48	5
49	11
50	43
51	85
52	165
53	267
54	419
55	13
56	3
57	51
58	77
59	173
60	259
61	427
62	597
63	861
64	163
65	87
66	41
67	209
68	223
69	463
70	561
71	125

n	a(n)
1	1
2	15
3	39
4	89
5	161
6	271
7	415
8	17
9	37
10	91
11	159
12	273
13	413
14	19
15	35
16	93
17	157
18	275
19	411
20	21
21	33
22	95
23	155
24	277
25	409
26	23
27	31
28	97
29	153
30	279
31	407
32	25
33	29
34	99
35	151
36	281
37	405
38	27
39	101
40	149
41	283
42	403
43	621
44	65
45	63
46	187
47	245
48	5
49	11
50	43
51	85
52	165
53	267
54	419
55	13
56	3
57	51
58	77
59	173
60	259
61	427
62	597
63	861
64	163
65	87
66	41
67	209
68	223
69	463
70	561
71	125