A043305 - cp's OEIS frontend

A043305 Numbers k such that the numerator of the sum of the reciprocals of the divisors of k (=A017665(k)) is a power of 2.

n	a(n)
1	1
2	3
3	6
4	7
5	15
6	21
7	28
8	31
9	33
10	42
11	69
12	84
13	91
14	93
15	105
16	127
17	135
18	141
19	186
20	217
21	231
22	270
23	273
24	285
25	381
26	420
27	465
28	483
29	496
30	546
31	573
32	651
33	762
34	775
35	819
36	861
37	868
38	889
39	924
40	945
41	987
42	1023
43	1149
44	1185
45	1302
46	1365
47	1419
48	1485
49	1488
50	1561
51	1638
52	1743
53	1890

[1, 3, 6, 7, 15, 21, 28, 31, 33, 42, 69, 84, 91, 93, 105, 127, 135, 141, 186, 217, 231, 270, 273, 285, 381, 420, 465, 483, 496, 546, 573, 651, 762, 775, 819, 861, 868, 889, 924, 945, 987, 1023, 1149, 1185, 1302, 1365, 1419, 1485, 1488, 1561, 1638, 1743, 1890]

cp's OEIS Frontend

A043305 Numbers k such that the numerator of the sum of the reciprocals of the divisors of k (=A017665(k)) is a power of 2.

Table of values

List of values