A378983 - cp's OEIS frontend

A378983 Numbers k such that (A003961(k)-2*k) divides (A003961(k)-(1+sigma(k))), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	8
7	10
8	11
9	15
10	16
11	17
12	25
13	26
14	29
15	32
16	33
17	35
18	39
19	41
20	57
21	59
22	64
23	71
24	93
25	101
26	107
27	125
28	128
29	137
30	149
31	161
32	179
33	191
34	197
35	227
36	239
37	256
38	269
39	281
40	311
41	347
42	419
43	431
44	461
45	512
46	521
47	569
48	599
49	617
50	641
51	659
52	782
53	809
54	821
55	827
56	857
57	881
58	1019
59	1024
60	1030
61	1031
62	1034
63	1049
64	1054
65	1061
66	1091
67	1151

[1, 2, 3, 4, 5, 8, 10, 11, 15, 16, 17, 25, 26, 29, 32, 33, 35, 39, 41, 57, 59, 64, 71, 93, 101, 107, 125, 128, 137, 149, 161, 179, 191, 197, 227, 239, 256, 269, 281, 311, 347, 419, 431, 461, 512, 521, 569, 599, 617, 641, 659, 782, 809, 821, 827, 857, 881, 1019, 1024, 1030, 1031, 1034, 1049, 1054, 1061, 1091, 1151]

cp's OEIS Frontend

A378983 Numbers k such that (A003961(k)-2*k) divides (A003961(k)-(1+sigma(k))), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.

Table of values

List of values