A226736 - cp's OEIS frontend

A226736 Triangular numbers such that the binary representation is of the form either Tbt or Tt, where T and t are binary representations of triangular numbers with equal binary length, and b is a binary digit: b = 1 or 0.

n	a(n)
1	3
2	6
3	15
4	28
5	105
6	351
7	496
8	1830
9	7140
10	30876
11	129795
12	508536
13	2029105
14	8260080
15	32817151
16	33550336
17	133179360
18	533811475
19	2139135936
20	8564460003
21	34292793216
22	137220150385
23	549219598080
24	2197036652910
25	8791800675840
26	35164716131980
27	140703139101696
28	562926884985640

[3, 6, 15, 28, 105, 351, 496, 1830, 7140, 30876, 129795, 508536, 2029105, 8260080, 32817151, 33550336, 133179360, 533811475, 2139135936, 8564460003, 34292793216, 137220150385, 549219598080, 2197036652910, 8791800675840, 35164716131980, 140703139101696, 562926884985640]

cp's OEIS Frontend

A226736 Triangular numbers such that the binary representation is of the form either Tbt or Tt, where T and t are binary representations of triangular numbers with equal binary length, and b is a binary digit: b = 1 or 0.

Table of values

List of values