A086072 - cp's OEIS frontend

A086072 Number of 1's in decimal expansion of triangular number n(n+1)/2.

n	a(n)
0	0
1	1
2	0
3	0
4	1
5	1
6	1
7	0
8	0
9	0
10	0
11	0
12	0
13	1
14	1
15	1
16	1
17	1
18	2
19	1
20	1
21	1
22	0
23	0
24	0
25	0
26	1
27	0
28	0
29	0
30	0
31	0
32	0
33	1
34	0
35	0
36	0
37	0
38	1
39	0
40	0
41	1
42	0
43	0
44	0
45	1
46	2
47	2
48	2
49	1
50	1
51	1
52	1
53	2
54	1
55	1
56	1
57	1
58	3
59	1
60	1
61	2
62	1
63	1
64	0
65	1
66	2
67	0
68	0
69	1
70	0
71	0
72	0
73	1
74	0
75	0
76	0
77	0
78	1
79	1
80	0
81	1
82	0
83	0
84	0
85	0
86	1
87	0
88	1
89	0
90	0
91	1
92	0
93	1
94	0
95	0
96	0
97	0
98	1
99	0
100	0
101	2
102	0
103	0
104	0

[0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 2, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 2, 1, 1, 0, 1, 2, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 0]

cp's OEIS Frontend

A086072 Number of 1's in decimal expansion of triangular number n(n+1)/2.

Table of values

List of values

n	a(n)
0	0
1	1
2	0
3	0
4	1
5	1
6	1
7	0
8	0
9	0
10	0
11	0
12	0
13	1
14	1
15	1
16	1
17	1
18	2
19	1
20	1
21	1
22	0
23	0
24	0
25	0
26	1
27	0
28	0
29	0
30	0
31	0
32	0
33	1
34	0
35	0
36	0
37	0
38	1
39	0
40	0
41	1
42	0
43	0
44	0
45	1
46	2
47	2
48	2
49	1
50	1
51	1
52	1
53	2
54	1
55	1
56	1
57	1
58	3
59	1
60	1
61	2
62	1
63	1
64	0
65	1
66	2
67	0
68	0
69	1
70	0
71	0
72	0
73	1
74	0
75	0
76	0
77	0
78	1
79	1
80	0
81	1
82	0
83	0
84	0
85	0
86	1
87	0
88	1
89	0
90	0
91	1
92	0
93	1
94	0
95	0
96	0
97	0
98	1
99	0
100	0
101	2
102	0
103	0
104	0

n	a(n)
0	0
1	1
2	0
3	0
4	1
5	1
6	1
7	0
8	0
9	0
10	0
11	0
12	0
13	1
14	1
15	1
16	1
17	1
18	2
19	1
20	1
21	1
22	0
23	0
24	0
25	0
26	1
27	0
28	0
29	0
30	0
31	0
32	0
33	1
34	0
35	0
36	0
37	0
38	1
39	0
40	0
41	1
42	0
43	0
44	0
45	1
46	2
47	2
48	2
49	1
50	1
51	1
52	1
53	2
54	1
55	1
56	1
57	1
58	3
59	1
60	1
61	2
62	1
63	1
64	0
65	1
66	2
67	0
68	0
69	1
70	0
71	0
72	0
73	1
74	0
75	0
76	0
77	0
78	1
79	1
80	0
81	1
82	0
83	0
84	0
85	0
86	1
87	0
88	1
89	0
90	0
91	1
92	0
93	1
94	0
95	0
96	0
97	0
98	1
99	0
100	0
101	2
102	0
103	0
104	0

n	a(n)
0	0
1	1
2	0
3	0
4	1
5	1
6	1
7	0
8	0
9	0
10	0
11	0
12	0
13	1
14	1
15	1
16	1
17	1
18	2
19	1
20	1
21	1
22	0
23	0
24	0
25	0
26	1
27	0
28	0
29	0
30	0
31	0
32	0
33	1
34	0
35	0
36	0
37	0
38	1
39	0
40	0
41	1
42	0
43	0
44	0
45	1
46	2
47	2
48	2
49	1
50	1
51	1
52	1
53	2
54	1
55	1
56	1
57	1
58	3
59	1
60	1
61	2
62	1
63	1
64	0
65	1
66	2
67	0
68	0
69	1
70	0
71	0
72	0
73	1
74	0
75	0
76	0
77	0
78	1
79	1
80	0
81	1
82	0
83	0
84	0
85	0
86	1
87	0
88	1
89	0
90	0
91	1
92	0
93	1
94	0
95	0
96	0
97	0
98	1
99	0
100	0
101	2
102	0
103	0
104	0