A004157 - cp's OEIS frontend

A004157 Sum of digits of n-th triangular number.

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	6
6	3
7	10
8	9
9	9
10	10
11	12
12	15
13	10
14	6
15	3
16	10
17	9
18	9
19	10
20	3
21	6
22	10
23	15
24	3
25	10
26	9
27	18
28	10
29	12
30	15
31	19
32	15
33	12
34	19
35	9
36	18
37	10
38	12
39	15
40	10
41	15
42	12
43	19
44	18
45	9
46	10
47	12
48	15
49	10
50	15
51	12
52	19
53	9
54	18
55	10
56	21
57	15
58	10
59	15
60	12
61	19
62	18
63	9
64	10
65	12
66	6
67	19
68	15
69	12
70	19
71	18
72	18
73	10
74	21
75	15
76	19
77	6
78	12
79	10

[0, 1, 3, 6, 1, 6, 3, 10, 9, 9, 10, 12, 15, 10, 6, 3, 10, 9, 9, 10, 3, 6, 10, 15, 3, 10, 9, 18, 10, 12, 15, 19, 15, 12, 19, 9, 18, 10, 12, 15, 10, 15, 12, 19, 18, 9, 10, 12, 15, 10, 15, 12, 19, 9, 18, 10, 21, 15, 10, 15, 12, 19, 18, 9, 10, 12, 6, 19, 15, 12, 19, 18, 18, 10, 21, 15, 19, 6, 12, 10]

cp's OEIS Frontend

A004157 Sum of digits of n-th triangular number.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	6
6	3
7	10
8	9
9	9
10	10
11	12
12	15
13	10
14	6
15	3
16	10
17	9
18	9
19	10
20	3
21	6
22	10
23	15
24	3
25	10
26	9
27	18
28	10
29	12
30	15
31	19
32	15
33	12
34	19
35	9
36	18
37	10
38	12
39	15
40	10
41	15
42	12
43	19
44	18
45	9
46	10
47	12
48	15
49	10
50	15
51	12
52	19
53	9
54	18
55	10
56	21
57	15
58	10
59	15
60	12
61	19
62	18
63	9
64	10
65	12
66	6
67	19
68	15
69	12
70	19
71	18
72	18
73	10
74	21
75	15
76	19
77	6
78	12
79	10

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	6
6	3
7	10
8	9
9	9
10	10
11	12
12	15
13	10
14	6
15	3
16	10
17	9
18	9
19	10
20	3
21	6
22	10
23	15
24	3
25	10
26	9
27	18
28	10
29	12
30	15
31	19
32	15
33	12
34	19
35	9
36	18
37	10
38	12
39	15
40	10
41	15
42	12
43	19
44	18
45	9
46	10
47	12
48	15
49	10
50	15
51	12
52	19
53	9
54	18
55	10
56	21
57	15
58	10
59	15
60	12
61	19
62	18
63	9
64	10
65	12
66	6
67	19
68	15
69	12
70	19
71	18
72	18
73	10
74	21
75	15
76	19
77	6
78	12
79	10

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	6
6	3
7	10
8	9
9	9
10	10
11	12
12	15
13	10
14	6
15	3
16	10
17	9
18	9
19	10
20	3
21	6
22	10
23	15
24	3
25	10
26	9
27	18
28	10
29	12
30	15
31	19
32	15
33	12
34	19
35	9
36	18
37	10
38	12
39	15
40	10
41	15
42	12
43	19
44	18
45	9
46	10
47	12
48	15
49	10
50	15
51	12
52	19
53	9
54	18
55	10
56	21
57	15
58	10
59	15
60	12
61	19
62	18
63	9
64	10
65	12
66	6
67	19
68	15
69	12
70	19
71	18
72	18
73	10
74	21
75	15
76	19
77	6
78	12
79	10