A348426 - cp's OEIS frontend

A348426 Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).

n	a(n)
1	1
2	161
3	209
4	221
5	4265
6	12690
7	15941
8	22217
9	24041
10	25637
11	30377
12	38117
13	39077
14	48617
15	49097
16	55877
17	68441
18	73817
19	76457
20	80357
21	88457
22	95237
23	98117
24	99941
25	105641
26	110057
27	115397
28	122537
29	130217
30	131141
31	136517
32	143237
33	147941
34	148697
35	152357
36	154457
37	159077

[1, 161, 209, 221, 4265, 12690, 15941, 22217, 24041, 25637, 30377, 38117, 39077, 48617, 49097, 55877, 68441, 73817, 76457, 80357, 88457, 95237, 98117, 99941, 105641, 110057, 115397, 122537, 130217, 131141, 136517, 143237, 147941, 148697, 152357, 154457, 159077]

cp's OEIS Frontend

A348426 Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).

Table of values

List of values