A266115 - cp's OEIS frontend

A266115 Numbers which have smaller siblings in A263267-tree: numbers n for which there exists some k < n such that k - d(k) = n - d(n), where d(n) = A000005(n), the number of divisors of n.

n	a(n)
1	2
2	4
3	10
4	12
5	15
6	16
7	21
8	26
9	28
10	30
11	33
12	36
13	39
14	42
15	45
16	48
17	52
18	54
19	55
20	60
21	63
22	64
23	66
24	69
25	70
26	75
27	76
28	78
29	80
30	85
31	90
32	91
33	100
34	108
35	110
36	111
37	112
38	115
39	117
40	122
41	124
42	126
43	129
44	132
45	133
46	138
47	140
48	141
49	144
50	147
51	148
52	150
53	153
54	156
55	159
56	165
57	168
58	170
59	171
60	172
61	174
62	176
63	180
64	182
65	183
66	189
67	190
68	192
69	196
70	201
71	207
72	208
73	213
74	222

[2, 4, 10, 12, 15, 16, 21, 26, 28, 30, 33, 36, 39, 42, 45, 48, 52, 54, 55, 60, 63, 64, 66, 69, 70, 75, 76, 78, 80, 85, 90, 91, 100, 108, 110, 111, 112, 115, 117, 122, 124, 126, 129, 132, 133, 138, 140, 141, 144, 147, 148, 150, 153, 156, 159, 165, 168, 170, 171, 172, 174, 176, 180, 182, 183, 189, 190, 192, 196, 201, 207, 208, 213, 222]

cp's OEIS Frontend

A266115 Numbers which have smaller siblings in A263267-tree: numbers n for which there exists some k < n such that k - d(k) = n - d(n), where d(n) = A000005(n), the number of divisors of n.

Table of values

List of values

n	a(n)
1	2
2	4
3	10
4	12
5	15
6	16
7	21
8	26
9	28
10	30
11	33
12	36
13	39
14	42
15	45
16	48
17	52
18	54
19	55
20	60
21	63
22	64
23	66
24	69
25	70
26	75
27	76
28	78
29	80
30	85
31	90
32	91
33	100
34	108
35	110
36	111
37	112
38	115
39	117
40	122
41	124
42	126
43	129
44	132
45	133
46	138
47	140
48	141
49	144
50	147
51	148
52	150
53	153
54	156
55	159
56	165
57	168
58	170
59	171
60	172
61	174
62	176
63	180
64	182
65	183
66	189
67	190
68	192
69	196
70	201
71	207
72	208
73	213
74	222

n	a(n)
1	2
2	4
3	10
4	12
5	15
6	16
7	21
8	26
9	28
10	30
11	33
12	36
13	39
14	42
15	45
16	48
17	52
18	54
19	55
20	60
21	63
22	64
23	66
24	69
25	70
26	75
27	76
28	78
29	80
30	85
31	90
32	91
33	100
34	108
35	110
36	111
37	112
38	115
39	117
40	122
41	124
42	126
43	129
44	132
45	133
46	138
47	140
48	141
49	144
50	147
51	148
52	150
53	153
54	156
55	159
56	165
57	168
58	170
59	171
60	172
61	174
62	176
63	180
64	182
65	183
66	189
67	190
68	192
69	196
70	201
71	207
72	208
73	213
74	222

n	a(n)
1	2
2	4
3	10
4	12
5	15
6	16
7	21
8	26
9	28
10	30
11	33
12	36
13	39
14	42
15	45
16	48
17	52
18	54
19	55
20	60
21	63
22	64
23	66
24	69
25	70
26	75
27	76
28	78
29	80
30	85
31	90
32	91
33	100
34	108
35	110
36	111
37	112
38	115
39	117
40	122
41	124
42	126
43	129
44	132
45	133
46	138
47	140
48	141
49	144
50	147
51	148
52	150
53	153
54	156
55	159
56	165
57	168
58	170
59	171
60	172
61	174
62	176
63	180
64	182
65	183
66	189
67	190
68	192
69	196
70	201
71	207
72	208
73	213
74	222