A213516 - cp's OEIS frontend

A213516 Triangular numbers having only 1 or 2 different digits in base 10.

n	a(n)
1	0
2	1
3	3
4	6
5	10
6	15
7	21
8	28
9	36
10	45
11	55
12	66
13	78
14	91
15	171
16	300
17	595
18	666
19	990
20	1711
21	2211
22	3003
23	5050
24	5151
25	5565
26	5995
27	6555
28	8778
29	10011
30	66066
31	222111
32	255255
33	333336
34	500500
35	600060
36	828828
37	887778
38	1188111
39	5656566
40	22221111
41	50005000
42	51151555
43	88877778

[0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 171, 300, 595, 666, 990, 1711, 2211, 3003, 5050, 5151, 5565, 5995, 6555, 8778, 10011, 66066, 222111, 255255, 333336, 500500, 600060, 828828, 887778, 1188111, 5656566, 22221111, 50005000, 51151555, 88877778]

cp's OEIS Frontend

A213516 Triangular numbers having only 1 or 2 different digits in base 10.

Table of values

List of values