A072188 - cp's OEIS frontend

A072188 Numbers k that divide sigma(k-1)+sigma(k)+sigma(k+1), where sigma() is the "sum of integer divisors" function.

n	a(n)
1	2
2	5
3	7
4	33
5	18336
6	19262
7	38184
8	54722
9	458010
10	1402224
11	1473624
12	1708480
13	3680560
14	3733584
15	5829841
16	7769904
17	13204262
18	72873362
19	136910448
20	252961224
21	509874800
22	1138081558
23	3414097921
24	5440847376
25	7285326504
26	8986032648
27	14409659936
28	15953956256
29	23556877704

[2, 5, 7, 33, 18336, 19262, 38184, 54722, 458010, 1402224, 1473624, 1708480, 3680560, 3733584, 5829841, 7769904, 13204262, 72873362, 136910448, 252961224, 509874800, 1138081558, 3414097921, 5440847376, 7285326504, 8986032648, 14409659936, 15953956256, 23556877704]

cp's OEIS Frontend

A072188 Numbers k that divide sigma(k-1)+sigma(k)+sigma(k+1), where sigma() is the "sum of integer divisors" function.

Table of values

List of values