A361818 - cp's OEIS frontend

A361818 For any number k >= 0, let T_k be the triangle whose base corresponds to the ternary expansion of k (without leading zeros) and other values, say t above u and v, satisfy t = (-u-v) mod 3; this sequence lists the numbers k such that T_k has 3-fold rotational symmetry.

n	a(n)
1	0
2	1
3	2
4	4
5	8
6	13
7	26
8	34
9	40
10	46
11	59
12	65
13	80
14	112
15	121
16	130
17	224
18	233
19	242
20	304
21	364
22	424
23	518
24	578
25	728
26	772
27	862
28	925
29	1003
30	1093
31	1183
32	1261
33	1324
34	1414
35	1535
36	1598
37	1688
38	1766
39	1856
40	1919
41	2006
42	2096
43	2186
44	2257
45	2509
46	2734
47	3028
48	3280
49	3532
50	3826
51	4051

[0, 1, 2, 4, 8, 13, 26, 34, 40, 46, 59, 65, 80, 112, 121, 130, 224, 233, 242, 304, 364, 424, 518, 578, 728, 772, 862, 925, 1003, 1093, 1183, 1261, 1324, 1414, 1535, 1598, 1688, 1766, 1856, 1919, 2006, 2096, 2186, 2257, 2509, 2734, 3028, 3280, 3532, 3826, 4051]

cp's OEIS Frontend

A361818 For any number k >= 0, let T_k be the triangle whose base corresponds to the ternary expansion of k (without leading zeros) and other values, say t above u and v, satisfy t = (-u-v) mod 3; this sequence lists the numbers k such that T_k has 3-fold rotational symmetry.

Table of values

List of values