A086073 - cp's OEIS frontend

A086073 Number of 2's in decimal expansion of triangular number n(n+1)/2.

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

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

cp's OEIS Frontend

A086073 Number of 2's in decimal expansion of triangular number n(n+1)/2.

Table of values

List of values

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

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

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