A126888 - cp's OEIS frontend

A126888 a(n) is the smallest positive integer such that floor(a(n)/d(a(n))) = n, or -1 if no such number exists, where d(m) is the number of positive divisors of m.

n	a(n)
1	1
2	5
3	7
4	28
5	11
6	13
7	44
8	17
9	19
10	63
11	23
12	51
13	55
14	29
15	31
16	49
17	69
18	37
19	77
20	41
21	43
22	91
23	47
24	147
25	153
26	53
27	111
28	115
29	59
30	61
31	125
32	129
33	67
34	207
35	71
36	73
37	296
38	155
39	79
40	121
41	83
42	680
43	261
44	89
45	183
46	185
47	284
48	97
49	399
50	101
51	103
52	209
53	107
54	109
55	221
56	113
57	459
58	235
59	237
60	363
61	247
62	249

[1, 5, 7, 28, 11, 13, 44, 17, 19, 63, 23, 51, 55, 29, 31, 49, 69, 37, 77, 41, 43, 91, 47, 147, 153, 53, 111, 115, 59, 61, 125, 129, 67, 207, 71, 73, 296, 155, 79, 121, 83, 680, 261, 89, 183, 185, 284, 97, 399, 101, 103, 209, 107, 109, 221, 113, 459, 235, 237, 363, 247, 249]

cp's OEIS Frontend

A126888 a(n) is the smallest positive integer such that floor(a(n)/d(a(n))) = n, or -1 if no such number exists, where d(m) is the number of positive divisors of m.

Table of values

List of values

n	a(n)
1	1
2	5
3	7
4	28
5	11
6	13
7	44
8	17
9	19
10	63
11	23
12	51
13	55
14	29
15	31
16	49
17	69
18	37
19	77
20	41
21	43
22	91
23	47
24	147
25	153
26	53
27	111
28	115
29	59
30	61
31	125
32	129
33	67
34	207
35	71
36	73
37	296
38	155
39	79
40	121
41	83
42	680
43	261
44	89
45	183
46	185
47	284
48	97
49	399
50	101
51	103
52	209
53	107
54	109
55	221
56	113
57	459
58	235
59	237
60	363
61	247
62	249

n	a(n)
1	1
2	5
3	7
4	28
5	11
6	13
7	44
8	17
9	19
10	63
11	23
12	51
13	55
14	29
15	31
16	49
17	69
18	37
19	77
20	41
21	43
22	91
23	47
24	147
25	153
26	53
27	111
28	115
29	59
30	61
31	125
32	129
33	67
34	207
35	71
36	73
37	296
38	155
39	79
40	121
41	83
42	680
43	261
44	89
45	183
46	185
47	284
48	97
49	399
50	101
51	103
52	209
53	107
54	109
55	221
56	113
57	459
58	235
59	237
60	363
61	247
62	249

n	a(n)
1	1
2	5
3	7
4	28
5	11
6	13
7	44
8	17
9	19
10	63
11	23
12	51
13	55
14	29
15	31
16	49
17	69
18	37
19	77
20	41
21	43
22	91
23	47
24	147
25	153
26	53
27	111
28	115
29	59
30	61
31	125
32	129
33	67
34	207
35	71
36	73
37	296
38	155
39	79
40	121
41	83
42	680
43	261
44	89
45	183
46	185
47	284
48	97
49	399
50	101
51	103
52	209
53	107
54	109
55	221
56	113
57	459
58	235
59	237
60	363
61	247
62	249