A217259 - cp's OEIS frontend

A217259 Numbers n such that sigma(n+1) - sigma(n-1) = 2; sigma(n) = A000203(n) = sum of divisors of n.

n	a(n)
1	4
2	6
3	12
4	18
5	30
6	42
7	60
8	72
9	102
10	108
11	138
12	150
13	180
14	192
15	198
16	228
17	240
18	270
19	282
20	312
21	348
22	420
23	432
24	435
25	462
26	522
27	570
28	600
29	618
30	642
31	660
32	810
33	822
34	828
35	858
36	882
37	1020
38	1032
39	1050
40	1062
41	1092
42	1152
43	1230
44	1278
45	1290
46	1302
47	1320
48	1428
49	1452
50	1482
51	1488

[4, 6, 12, 18, 30, 42, 60, 72, 102, 108, 138, 150, 180, 192, 198, 228, 240, 270, 282, 312, 348, 420, 432, 435, 462, 522, 570, 600, 618, 642, 660, 810, 822, 828, 858, 882, 1020, 1032, 1050, 1062, 1092, 1152, 1230, 1278, 1290, 1302, 1320, 1428, 1452, 1482, 1488]

cp's OEIS Frontend

A217259 Numbers n such that sigma(n+1) - sigma(n-1) = 2; sigma(n) = A000203(n) = sum of divisors of n.

Table of values

List of values