A386430 - cp's OEIS frontend

A386430 Odd numbers k such that there are no prime factors p of sigma(k) such that p does not divide A003961(k) and the valuation(k, p) is different from valuation(sigma(k), p), where A003961 is fully multiplicative with a(p) = nextprime(p), and sigma is the sum of divisors function.

n	a(n)
1	1
2	3
3	7
4	15
5	21
6	27
7	31
8	33
9	57
10	69
11	87
12	91
13	93
14	105
15	127
16	141
17	177
18	189
19	195
20	217
21	231
22	237
23	273
24	285
25	301
26	381
27	399
28	447
29	465
30	483
31	495
32	513
33	567
34	573
35	597
36	609
37	627
38	651
39	717
40	775
41	819
42	837
43	861
44	889
45	903
46	987
47	1023
48	1029
49	1149
50	1185
51	1239
52	1311
53	1365
54	1419
55	1431
56	1437
57	1455
58	1497
59	1561
60	1653
61	1659
62	1687
63	1743

[1, 3, 7, 15, 21, 27, 31, 33, 57, 69, 87, 91, 93, 105, 127, 141, 177, 189, 195, 217, 231, 237, 273, 285, 301, 381, 399, 447, 465, 483, 495, 513, 567, 573, 597, 609, 627, 651, 717, 775, 819, 837, 861, 889, 903, 987, 1023, 1029, 1149, 1185, 1239, 1311, 1365, 1419, 1431, 1437, 1455, 1497, 1561, 1653, 1659, 1687, 1743]

cp's OEIS Frontend

A386430 Odd numbers k such that there are no prime factors p of sigma(k) such that p does not divide A003961(k) and the valuation(k, p) is different from valuation(sigma(k), p), where A003961 is fully multiplicative with a(p) = nextprime(p), and sigma is the sum of divisors function.

Table of values

List of values