A071390 - cp's OEIS frontend

A071390 Least number m such that sigma(m) - phi(m) = n, or 0 if no such m exists.

n	a(n)
1	0
2	2
3	0
4	0
5	4
6	0
7	9
8	0
9	0
10	6
11	8
12	0
13	0
14	10
15	49
16	15
17	0
18	14
19	0
20	21
21	0
22	27
23	16
24	12
25	0
26	22
27	169
28	33
29	0
30	26
31	0
32	39
33	18
34	20
35	289
36	65
37	0
38	34
39	361
40	51
41	0
42	38
43	0
44	28
45	0
46	0
47	32
48	95
49	0
50	46
51	0
52	24
53	0
54	45
55	0
56	115
57	0
58	0
59	841
60	161
61	0
62	58
63	961
64	30
65	0
66	62
67	81
68	63
69	0
70	0
71	0
72	155
73	50
74	40
75	1369
76	217
77	0
78	74

[0, 2, 0, 0, 4, 0, 9, 0, 0, 6, 8, 0, 0, 10, 49, 15, 0, 14, 0, 21, 0, 27, 16, 12, 0, 22, 169, 33, 0, 26, 0, 39, 18, 20, 289, 65, 0, 34, 361, 51, 0, 38, 0, 28, 0, 0, 32, 95, 0, 46, 0, 24, 0, 45, 0, 115, 0, 0, 841, 161, 0, 58, 961, 30, 0, 62, 81, 63, 0, 0, 0, 155, 50, 40, 1369, 217, 0, 74]

cp's OEIS Frontend

A071390 Least number m such that sigma(m) - phi(m) = n, or 0 if no such m exists.

Table of values

List of values