A203621 - cp's OEIS frontend

A203621 Highly anti-imperfect numbers: numbers k that sets a record for the value of |sigma(k)-k|, where sigma(k) is the sum of the anti-divisors of k.

n	a(n)
1	1
2	2
3	7
4	10
5	13
6	17
7	22
8	27
9	28
10	32
11	38
12	45
13	52
14	60
15	63
16	67
17	77
18	95
19	105
20	130
21	137
22	143
23	157
24	158
25	175
26	193
27	203
28	247
29	297
30	315
31	357
32	423
33	462
34	472
35	473
36	578
37	675
38	682
39	742
40	770
41	787
42	1012
43	1138
44	1215
45	1417
46	1463
47	1732
48	1957
49	2047
50	2048
51	2327
52	2363
53	2632

[1, 2, 7, 10, 13, 17, 22, 27, 28, 32, 38, 45, 52, 60, 63, 67, 77, 95, 105, 130, 137, 143, 157, 158, 175, 193, 203, 247, 297, 315, 357, 423, 462, 472, 473, 578, 675, 682, 742, 770, 787, 1012, 1138, 1215, 1417, 1463, 1732, 1957, 2047, 2048, 2327, 2363, 2632]

cp's OEIS Frontend

A203621 Highly anti-imperfect numbers: numbers k that sets a record for the value of |sigma(k)-k|, where sigma(k) is the sum of the anti-divisors of k.

Table of values

List of values

cp's OEIS Frontend

A203621 Highly anti-imperfect numbers: numbers k that sets a record for the value of |sigma*(k)-k|, where sigma*(k) is the sum of the anti-divisors of k.

Table of values

List of values

A203621 Highly anti-imperfect numbers: numbers k that sets a record for the value of |sigma(k)-k|, where sigma(k) is the sum of the anti-divisors of k.