A342672 - cp's OEIS frontend

A342672 a(n) = lcm(sigma(n), A003961(n)), where A003961 is fully multiplicative with a(prime(k)) = prime(k+1), and sigma is the sum of divisors of n.

n	a(n)
1	1
2	3
3	20
4	63
5	42
6	60
7	88
8	135
9	325
10	126
11	156
12	1260
13	238
14	264
15	840
16	2511
17	342
18	975
19	460
20	126
21	1760
22	468
23	696
24	540
25	1519
26	714
27	1000
28	5544
29	930
30	2520
31	1184
32	1701
33	3120
34	1026
35	3696
36	20475
37	1558
38	1380
39	4760
40	1890
41	1806
42	5280
43	2068
44	3276
45	13650
46	2088
47	2544
48	50220
49	6897
50	4557
51	6840
52	14994
53	3186
54	3000
55	6552
56	11880
57	1840
58	2790

[1, 3, 20, 63, 42, 60, 88, 135, 325, 126, 156, 1260, 238, 264, 840, 2511, 342, 975, 460, 126, 1760, 468, 696, 540, 1519, 714, 1000, 5544, 930, 2520, 1184, 1701, 3120, 1026, 3696, 20475, 1558, 1380, 4760, 1890, 1806, 5280, 2068, 3276, 13650, 2088, 2544, 50220, 6897, 4557, 6840, 14994, 3186, 3000, 6552, 11880, 1840, 2790]

cp's OEIS Frontend

A342672 a(n) = lcm(sigma(n), A003961(n)), where A003961 is fully multiplicative with a(prime(k)) = prime(k+1), and sigma is the sum of divisors of n.

Table of values

List of values