A078651 - cp's OEIS frontend

A078651 Number of increasing geometric-progression subsequences of [1,...,n] with integral successive-term ratio and length >= 1.

n	a(n)
1	1
2	3
3	5
4	9
5	11
6	15
7	17
8	23
9	27
10	31
11	33
12	40
13	42
14	46
15	50
16	59
17	61
18	68
19	70
20	77
21	81
22	85
23	87
24	97
25	101
26	105
27	111
28	118
29	120
30	128
31	130
32	141
33	145
34	149
35	153
36	165
37	167
38	171
39	175
40	185
41	187
42	195
43	197
44	204
45	211
46	215
47	217
48	231
49	235
50	242
51	246
52	253
53	255
54	265
55	269
56	279
57	283
58	287

[1, 3, 5, 9, 11, 15, 17, 23, 27, 31, 33, 40, 42, 46, 50, 59, 61, 68, 70, 77, 81, 85, 87, 97, 101, 105, 111, 118, 120, 128, 130, 141, 145, 149, 153, 165, 167, 171, 175, 185, 187, 195, 197, 204, 211, 215, 217, 231, 235, 242, 246, 253, 255, 265, 269, 279, 283, 287]

cp's OEIS Frontend

A078651 Number of increasing geometric-progression subsequences of [1,...,n] with integral successive-term ratio and length >= 1.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	9
5	11
6	15
7	17
8	23
9	27
10	31
11	33
12	40
13	42
14	46
15	50
16	59
17	61
18	68
19	70
20	77
21	81
22	85
23	87
24	97
25	101
26	105
27	111
28	118
29	120
30	128
31	130
32	141
33	145
34	149
35	153
36	165
37	167
38	171
39	175
40	185
41	187
42	195
43	197
44	204
45	211
46	215
47	217
48	231
49	235
50	242
51	246
52	253
53	255
54	265
55	269
56	279
57	283
58	287

n	a(n)
1	1
2	3
3	5
4	9
5	11
6	15
7	17
8	23
9	27
10	31
11	33
12	40
13	42
14	46
15	50
16	59
17	61
18	68
19	70
20	77
21	81
22	85
23	87
24	97
25	101
26	105
27	111
28	118
29	120
30	128
31	130
32	141
33	145
34	149
35	153
36	165
37	167
38	171
39	175
40	185
41	187
42	195
43	197
44	204
45	211
46	215
47	217
48	231
49	235
50	242
51	246
52	253
53	255
54	265
55	269
56	279
57	283
58	287

n	a(n)
1	1
2	3
3	5
4	9
5	11
6	15
7	17
8	23
9	27
10	31
11	33
12	40
13	42
14	46
15	50
16	59
17	61
18	68
19	70
20	77
21	81
22	85
23	87
24	97
25	101
26	105
27	111
28	118
29	120
30	128
31	130
32	141
33	145
34	149
35	153
36	165
37	167
38	171
39	175
40	185
41	187
42	195
43	197
44	204
45	211
46	215
47	217
48	231
49	235
50	242
51	246
52	253
53	255
54	265
55	269
56	279
57	283
58	287