A275660 - cp's OEIS frontend

A275660 Numbers n such that sigma(n) = Sum_{j=1..k} d(n^j) for some k, where sigma(n) is the sum of the divisors of n and d(n) is the number of divisors of n.

n	a(n)
1	1
2	13
3	19
4	34
5	43
6	53
7	58
8	89
9	103
10	151
11	229
12	251
13	254
14	329
15	341
16	349
17	404
18	433
19	463
20	593
21	674
22	701
23	739
24	859
25	1033
26	1223
27	1429
28	1483
29	1506
30	1670
31	1709
32	1826
33	1846
34	1886
35	1889
36	1948
37	1951
38	2067
39	2091
40	2143
41	2255
42	2308
43	2431
44	2699
45	3001
46	3079
47	3319
48	3739
49	4003
50	4093

[1, 13, 19, 34, 43, 53, 58, 89, 103, 151, 229, 251, 254, 329, 341, 349, 404, 433, 463, 593, 674, 701, 739, 859, 1033, 1223, 1429, 1483, 1506, 1670, 1709, 1826, 1846, 1886, 1889, 1948, 1951, 2067, 2091, 2143, 2255, 2308, 2431, 2699, 3001, 3079, 3319, 3739, 4003, 4093]

cp's OEIS Frontend

A275660 Numbers n such that sigma(n) = Sum_{j=1..k} d(n^j) for some k, where sigma(n) is the sum of the divisors of n and d(n) is the number of divisors of n.

Table of values

List of values