A342661 - cp's OEIS frontend

A342661 a(n) = n * sigma(A064989(n)), where A064989 is multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p, and sigma gives the sum of the divisors of its argument.

n	a(n)
1	1
2	2
3	9
4	4
5	20
6	18
7	42
8	8
9	63
10	40
11	88
12	36
13	156
14	84
15	180
16	16
17	238
18	126
19	342
20	80
21	378
22	176
23	460
24	72
25	325
26	312
27	405
28	168
29	696
30	360
31	930
32	32
33	792
34	476
35	840
36	252
37	1184
38	684
39	1404
40	160
41	1558
42	756
43	1806
44	352
45	1260
46	920
47	2068
48	144
49	1519
50	650
51	2142
52	624
53	2544
54	810
55	1760
56	336
57	3078
58	1392
59	3186
60	720
61	3660
62	1860
63	2646
64	64
65	3120

[1, 2, 9, 4, 20, 18, 42, 8, 63, 40, 88, 36, 156, 84, 180, 16, 238, 126, 342, 80, 378, 176, 460, 72, 325, 312, 405, 168, 696, 360, 930, 32, 792, 476, 840, 252, 1184, 684, 1404, 160, 1558, 756, 1806, 352, 1260, 920, 2068, 144, 1519, 650, 2142, 624, 2544, 810, 1760, 336, 3078, 1392, 3186, 720, 3660, 1860, 2646, 64, 3120]

cp's OEIS Frontend

A342661 a(n) = n * sigma(A064989(n)), where A064989 is multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p, and sigma gives the sum of the divisors of its argument.

Table of values

List of values