A364414 - cp's OEIS frontend

A364414 Numbers k with the property that the second part of the symmetric representation of sigma(k) is an octagon of width 1 and one of its vertices is also the central vertex of the first valley of the largest Dyck path of the diagram.

n	a(n)
1	21
2	27
3	33
4	39
5	51
6	57
7	63
8	69
9	81
10	87
11	93
12	99
13	111
14	117
15	123
16	129
17	141
18	147
19	153
20	159
21	171
22	177
23	183
24	189
25	201
26	207
27	213
28	219
29	231
30	237
31	243
32	249
33	261
34	267
35	273
36	279
37	291
38	297
39	303
40	309
41	321
42	327
43	333
44	339
45	351
46	357

[21, 27, 33, 39, 51, 57, 63, 69, 81, 87, 93, 99, 111, 117, 123, 129, 141, 147, 153, 159, 171, 177, 183, 189, 201, 207, 213, 219, 231, 237, 243, 249, 261, 267, 273, 279, 291, 297, 303, 309, 321, 327, 333, 339, 351, 357]

cp's OEIS Frontend

A364414 Numbers k with the property that the second part of the symmetric representation of sigma(k) is an octagon of width 1 and one of its vertices is also the central vertex of the first valley of the largest Dyck path of the diagram.

Table of values

List of values

n	a(n)
1	21
2	27
3	33
4	39
5	51
6	57
7	63
8	69
9	81
10	87
11	93
12	99
13	111
14	117
15	123
16	129
17	141
18	147
19	153
20	159
21	171
22	177
23	183
24	189
25	201
26	207
27	213
28	219
29	231
30	237
31	243
32	249
33	261
34	267
35	273
36	279
37	291
38	297
39	303
40	309
41	321
42	327
43	333
44	339
45	351
46	357

n	a(n)
1	21
2	27
3	33
4	39
5	51
6	57
7	63
8	69
9	81
10	87
11	93
12	99
13	111
14	117
15	123
16	129
17	141
18	147
19	153
20	159
21	171
22	177
23	183
24	189
25	201
26	207
27	213
28	219
29	231
30	237
31	243
32	249
33	261
34	267
35	273
36	279
37	291
38	297
39	303
40	309
41	321
42	327
43	333
44	339
45	351
46	357

n	a(n)
1	21
2	27
3	33
4	39
5	51
6	57
7	63
8	69
9	81
10	87
11	93
12	99
13	111
14	117
15	123
16	129
17	141
18	147
19	153
20	159
21	171
22	177
23	183
24	189
25	201
26	207
27	213
28	219
29	231
30	237
31	243
32	249
33	261
34	267
35	273
36	279
37	291
38	297
39	303
40	309
41	321
42	327
43	333
44	339
45	351
46	357