A067520 - cp's OEIS frontend

A067520 Triangular numbers whose index is a multiple of the sum of their digits.

n	a(n)
1	1
2	10
3	21
4	45
5	55
6	120
7	171
8	300
9	465
10	666
11	820
12	1035
13	1485
14	1830
15	2016
16	2211
17	2628
18	2850
19	2926
20	3321
21	4095
22	5050
23	5565
24	5886
25	7260
26	8001
27	8911
28	10011
29	10440
30	13203
31	14196
32	16290
33	17955
34	18145
35	18528
36	19701
37	20910
38	22155
39	23436
40	24310
41	29646

[1, 10, 21, 45, 55, 120, 171, 300, 465, 666, 820, 1035, 1485, 1830, 2016, 2211, 2628, 2850, 2926, 3321, 4095, 5050, 5565, 5886, 7260, 8001, 8911, 10011, 10440, 13203, 14196, 16290, 17955, 18145, 18528, 19701, 20910, 22155, 23436, 24310, 29646]

cp's OEIS Frontend

A067520 Triangular numbers whose index is a multiple of the sum of their digits.

Table of values

List of values