A246851 - cp's OEIS frontend

A246851 a(n) = smallest number k such that sigma(k+n) - sigma(k) = k + n, or -1 if no solution exists.

n	a(n)
1	1
2	1
3	7
4	1
5	3577
6	1
7	25
8	8
9	13
10	1
11	403668223
12	1
13	833
14	262
15	19
16	1
17	27
18	1
19	793
20	5
21	45
22	1
23	1795
24	66
25	8
26	9
27	31
28	1
29	2005
30	1
31	309
32	32
33	261
34	4238
35	22490141
36	1
37	21
38	40
39	43
40	1
41	399
42	1
43	1897
44	262
45	193
46	1
47	27
48	1252907952
49	711
50	49
51	1158765
52	1
53	271259
54	27
55	129
56	20518072

[1, 1, 7, 1, 3577, 1, 25, 8, 13, 1, 403668223, 1, 833, 262, 19, 1, 27, 1, 793, 5, 45, 1, 1795, 66, 8, 9, 31, 1, 2005, 1, 309, 32, 261, 4238, 22490141, 1, 21, 40, 43, 1, 399, 1, 1897, 262, 193, 1, 27, 1252907952, 711, 49, 1158765, 1, 271259, 27, 129, 20518072]

cp's OEIS Frontend

A246851 a(n) = smallest number k such that sigma(k+n) - sigma(k) = k + n, or -1 if no solution exists.

Table of values

List of values