A033100 - cp's OEIS frontend

A033100 Number of 3's when k is written in base b for all b and k satisfying 2<=b<=n+1, 1<=k<=n.

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	3
9	4
10	5
11	7
12	9
13	12
14	14
15	19
16	21
17	24
18	28
19	33
20	35
21	40
22	43
23	49
24	53
25	57
26	60
27	68
28	73
29	78
30	84
31	92
32	95
33	103
34	107
35	114
36	119
37	124
38	130
39	140
40	145
41	151
42	158
43	169
44	175
45	185
46	191
47	200
48	209
49	216
50	222
51	235
52	242
53	251
54	260
55	271
56	278

[0, 0, 1, 1, 1, 1, 2, 3, 4, 5, 7, 9, 12, 14, 19, 21, 24, 28, 33, 35, 40, 43, 49, 53, 57, 60, 68, 73, 78, 84, 92, 95, 103, 107, 114, 119, 124, 130, 140, 145, 151, 158, 169, 175, 185, 191, 200, 209, 216, 222, 235, 242, 251, 260, 271, 278]

cp's OEIS Frontend

A033100 Number of 3's when k is written in base b for all b and k satisfying 2<=b<=n+1, 1<=k<=n.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	3
9	4
10	5
11	7
12	9
13	12
14	14
15	19
16	21
17	24
18	28
19	33
20	35
21	40
22	43
23	49
24	53
25	57
26	60
27	68
28	73
29	78
30	84
31	92
32	95
33	103
34	107
35	114
36	119
37	124
38	130
39	140
40	145
41	151
42	158
43	169
44	175
45	185
46	191
47	200
48	209
49	216
50	222
51	235
52	242
53	251
54	260
55	271
56	278

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	3
9	4
10	5
11	7
12	9
13	12
14	14
15	19
16	21
17	24
18	28
19	33
20	35
21	40
22	43
23	49
24	53
25	57
26	60
27	68
28	73
29	78
30	84
31	92
32	95
33	103
34	107
35	114
36	119
37	124
38	130
39	140
40	145
41	151
42	158
43	169
44	175
45	185
46	191
47	200
48	209
49	216
50	222
51	235
52	242
53	251
54	260
55	271
56	278

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	3
9	4
10	5
11	7
12	9
13	12
14	14
15	19
16	21
17	24
18	28
19	33
20	35
21	40
22	43
23	49
24	53
25	57
26	60
27	68
28	73
29	78
30	84
31	92
32	95
33	103
34	107
35	114
36	119
37	124
38	130
39	140
40	145
41	151
42	158
43	169
44	175
45	185
46	191
47	200
48	209
49	216
50	222
51	235
52	242
53	251
54	260
55	271
56	278