A074802 - cp's OEIS frontend

A074802 Number of numbers k <= n such that tau(k) = tau(k+1) where tau(x) = A000005(x) is the number of divisors of x.

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

[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 12, 12, 12, 12, 12, 12, 12, 13, 14]

cp's OEIS Frontend

A074802 Number of numbers k <= n such that tau(k) = tau(k+1) where tau(x) = A000005(x) is the number of divisors of x.

Table of values

List of values

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

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

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