A262686 - cp's OEIS frontend

A262686 a(n) = largest number k such that k - d(k) = n, or 0 if no such number exists, where d(n) = the number of divisors of n (A000005).

n	a(n)
0	2
1	4
2	6
3	5
4	8
5	7
6	12
7	0
8	0
9	11
10	14
11	16
12	18
13	0
14	20
15	17
16	24
17	21
18	22
19	0
20	0
21	23
22	30
23	27
24	0
25	0
26	32
27	36
28	0
29	33
30	34
31	35
32	40
33	0
34	42
35	39
36	0
37	0
38	48
39	45
40	0
41	43
42	46
43	0
44	50
45	47
46	54
47	51
48	60
49	0
50	0
51	55
52	0
53	57
54	58
55	0
56	0
57	64
58	66
59	61
60	72
61	65
62	70
63	0
64	0
65	69
66	0
67	0
68	0
69	75
70	80
71	73
72	84
73	77
74	0
75	0
76	81
77	79
78	90
79	0
80	88
81	85
82	86
83	87
84	96
85	0
86	92
87	91
88	0
89	93
90	94
91	100
92	98
93	99
94	102
95	97
96	108
97	105
98	0
99	101

[2, 4, 6, 5, 8, 7, 12, 0, 0, 11, 14, 16, 18, 0, 20, 17, 24, 21, 22, 0, 0, 23, 30, 27, 0, 0, 32, 36, 0, 33, 34, 35, 40, 0, 42, 39, 0, 0, 48, 45, 0, 43, 46, 0, 50, 47, 54, 51, 60, 0, 0, 55, 0, 57, 58, 0, 0, 64, 66, 61, 72, 65, 70, 0, 0, 69, 0, 0, 0, 75, 80, 73, 84, 77, 0, 0, 81, 79, 90, 0, 88, 85, 86, 87, 96, 0, 92, 91, 0, 93, 94, 100, 98, 99, 102, 97, 108, 105, 0, 101]

cp's OEIS Frontend

A262686 a(n) = largest number k such that k - d(k) = n, or 0 if no such number exists, where d(n) = the number of divisors of n (A000005).

Table of values

List of values

n	a(n)
0	2
1	4
2	6
3	5
4	8
5	7
6	12
7	0
8	0
9	11
10	14
11	16
12	18
13	0
14	20
15	17
16	24
17	21
18	22
19	0
20	0
21	23
22	30
23	27
24	0
25	0
26	32
27	36
28	0
29	33
30	34
31	35
32	40
33	0
34	42
35	39
36	0
37	0
38	48
39	45
40	0
41	43
42	46
43	0
44	50
45	47
46	54
47	51
48	60
49	0
50	0
51	55
52	0
53	57
54	58
55	0
56	0
57	64
58	66
59	61
60	72
61	65
62	70
63	0
64	0
65	69
66	0
67	0
68	0
69	75
70	80
71	73
72	84
73	77
74	0
75	0
76	81
77	79
78	90
79	0
80	88
81	85
82	86
83	87
84	96
85	0
86	92
87	91
88	0
89	93
90	94
91	100
92	98
93	99
94	102
95	97
96	108
97	105
98	0
99	101

n	a(n)
0	2
1	4
2	6
3	5
4	8
5	7
6	12
7	0
8	0
9	11
10	14
11	16
12	18
13	0
14	20
15	17
16	24
17	21
18	22
19	0
20	0
21	23
22	30
23	27
24	0
25	0
26	32
27	36
28	0
29	33
30	34
31	35
32	40
33	0
34	42
35	39
36	0
37	0
38	48
39	45
40	0
41	43
42	46
43	0
44	50
45	47
46	54
47	51
48	60
49	0
50	0
51	55
52	0
53	57
54	58
55	0
56	0
57	64
58	66
59	61
60	72
61	65
62	70
63	0
64	0
65	69
66	0
67	0
68	0
69	75
70	80
71	73
72	84
73	77
74	0
75	0
76	81
77	79
78	90
79	0
80	88
81	85
82	86
83	87
84	96
85	0
86	92
87	91
88	0
89	93
90	94
91	100
92	98
93	99
94	102
95	97
96	108
97	105
98	0
99	101

n	a(n)
0	2
1	4
2	6
3	5
4	8
5	7
6	12
7	0
8	0
9	11
10	14
11	16
12	18
13	0
14	20
15	17
16	24
17	21
18	22
19	0
20	0
21	23
22	30
23	27
24	0
25	0
26	32
27	36
28	0
29	33
30	34
31	35
32	40
33	0
34	42
35	39
36	0
37	0
38	48
39	45
40	0
41	43
42	46
43	0
44	50
45	47
46	54
47	51
48	60
49	0
50	0
51	55
52	0
53	57
54	58
55	0
56	0
57	64
58	66
59	61
60	72
61	65
62	70
63	0
64	0
65	69
66	0
67	0
68	0
69	75
70	80
71	73
72	84
73	77
74	0
75	0
76	81
77	79
78	90
79	0
80	88
81	85
82	86
83	87
84	96
85	0
86	92
87	91
88	0
89	93
90	94
91	100
92	98
93	99
94	102
95	97
96	108
97	105
98	0
99	101