A286359 - cp's OEIS frontend

A286359 Compound filter: a(n) = P(sigma(n), sigma(2n)), where P(n,k) is sequence A000027 used as a pairing function, and sigma is the sum of divisors (A000203).

n	a(n)
1	4
2	39
3	109
4	217
5	259
6	753
7	473
8	1005
9	1288
10	1729
11	1093
12	3769
13	1499
14	3105
15	4489
16	4309
17	2503
18	8295
19	3101
20	8557
21	8033
22	7057
23	4489
24	16713
25	7534
26	9633
27	12601
28	15281
29	7051
30	28513
31	8033
32	17829
33	18193
34	15985
35	18193
36	40561
37	11363
38	19761
39	24809
40	37765
41	13903
42	50817
43	15269
44	34537
45	48283
46	28513
47	18193
48	70249
49	25708
50	47679
51	41113
52	47069
53	23059
54	79521
55	41113
56	67281
57	50801

[4, 39, 109, 217, 259, 753, 473, 1005, 1288, 1729, 1093, 3769, 1499, 3105, 4489, 4309, 2503, 8295, 3101, 8557, 8033, 7057, 4489, 16713, 7534, 9633, 12601, 15281, 7051, 28513, 8033, 17829, 18193, 15985, 18193, 40561, 11363, 19761, 24809, 37765, 13903, 50817, 15269, 34537, 48283, 28513, 18193, 70249, 25708, 47679, 41113, 47069, 23059, 79521, 41113, 67281, 50801]

cp's OEIS Frontend

A286359 Compound filter: a(n) = P(sigma(n), sigma(2n)), where P(n,k) is sequence A000027 used as a pairing function, and sigma is the sum of divisors (A000203).

Table of values

List of values