A334897 - cp's OEIS frontend

A334897 a(n) is the number of positive integers less than or equal to n that can be written as the geometric mean of two different positive integers less than or equal to n.

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

[0, 0, 0, 1, 1, 1, 1, 2, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 7, 7, 7, 7, 7, 10, 10, 12, 13, 13, 13, 13, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 23, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30, 31, 32, 32, 32, 32, 32, 36, 36, 36, 36, 36, 36, 36, 37, 37, 37, 37, 38, 38, 38, 38, 38, 38, 40, 42, 45]

cp's OEIS Frontend

A334897 a(n) is the number of positive integers less than or equal to n that can be written as the geometric mean of two different positive integers less than or equal to n.

Table of values

List of values

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

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

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