A076140 - cp's OEIS frontend

A076140 Triangular numbers T(k) that are three times another triangular number: T(k) such that T(k) = 3*T(m) for some m.

n	a(n)
0	0
1	3
2	45
3	630
4	8778
5	122265
6	1702935
7	23718828
8	330360660
9	4601330415
10	64088265153
11	892634381730
12	12432793079070
13	173166468725253
14	2411897769074475
15	33593402298317400
16	467895734407369128
17	6516946879404850395
18	90769360577260536405
19	1264254101202242659278

[0, 3, 45, 630, 8778, 122265, 1702935, 23718828, 330360660, 4601330415, 64088265153, 892634381730, 12432793079070, 173166468725253, 2411897769074475, 33593402298317400, 467895734407369128, 6516946879404850395, 90769360577260536405, 1264254101202242659278]

cp's OEIS Frontend

A076140 Triangular numbers T(k) that are three times another triangular number: T(k) such that T(k) = 3*T(m) for some m.

Table of values

List of values