A078426 - cp's OEIS frontend

A078426 Numbers k such that there is no solution to the equation sigma(x) = 2^k, where sigma(x) denotes the sum of the divisors of x.

n	a(n)
1	1
2	4
3	6
4	11
5	470
6	475
7	477
8	480
9	482
10	483
11	484
12	485
13	486
14	487
15	488
16	489
17	490
18	491
19	492
20	493
21	494
22	495
23	496
24	497
25	498
26	499
27	500
28	501
29	502
30	503
31	504
32	505
33	506
34	507
35	508
36	509
37	510
38	511
39	512
40	513
41	514
42	515
43	516
44	517
45	518
46	519
47	520
48	522
49	525
50	527
51	532
52	1077
53	1082

[1, 4, 6, 11, 470, 475, 477, 480, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 522, 525, 527, 532, 1077, 1082]

cp's OEIS Frontend

A078426 Numbers k such that there is no solution to the equation sigma(x) = 2^k, where sigma(x) denotes the sum of the divisors of x.

Table of values

List of values