A084307 - cp's OEIS frontend

A084307 a(n) is the least number x such that gcd(sigma(x), sigma(x+1)) = n.

n	a(n)
1	1
2	13
3	17
4	6
5	199
6	5
7	242
8	27
9	391
10	57
11	1296
12	22
13	882
14	12
15	648
16	93
17	175232
18	89
19	3872
20	236
21	195
22	1032
23	4875263
24	14
25	5739271
26	467
27	35377
28	83
29	1882384
30	58
31	3024
32	308
33	29240
34	201
35	1627208
36	118
37	79524
38	147
39	1682
40	56
41	46854024
42	82
43	229441
44	1204
45	2047
46	6301
47	83386957823

[1, 13, 17, 6, 199, 5, 242, 27, 391, 57, 1296, 22, 882, 12, 648, 93, 175232, 89, 3872, 236, 195, 1032, 4875263, 14, 5739271, 467, 35377, 83, 1882384, 58, 3024, 308, 29240, 201, 1627208, 118, 79524, 147, 1682, 56, 46854024, 82, 229441, 1204, 2047, 6301, 83386957823]

cp's OEIS Frontend

A084307 a(n) is the least number x such that gcd(sigma(x), sigma(x+1)) = n.

Table of values

List of values