A387410 - cp's OEIS frontend

A387410 Numbers k such that the odd part of (1+k) divides (1 + odd part of A048250(k)), where A048250 is sum of the squarefree divisors of n.

n	a(n)
1	1
2	3
3	7
4	15
5	31
6	63
7	127
8	255
9	511
10	639
11	1023
12	2047
13	2431
14	4095
15	5247
16	8191
17	14335
18	16383
19	32767
20	40959
21	44031
22	57855
23	65535
24	90111
25	126975
26	131071
27	204799
28	229375
29	262143
30	376831
31	524287
32	923647
33	1048575
34	1632255
35	2056191
36	2097151
37	2621439
38	2744319
39	4194303
40	6815743
41	8388607
42	8781823
43	16777215
44	19922943
45	24068095

[1, 3, 7, 15, 31, 63, 127, 255, 511, 639, 1023, 2047, 2431, 4095, 5247, 8191, 14335, 16383, 32767, 40959, 44031, 57855, 65535, 90111, 126975, 131071, 204799, 229375, 262143, 376831, 524287, 923647, 1048575, 1632255, 2056191, 2097151, 2621439, 2744319, 4194303, 6815743, 8388607, 8781823, 16777215, 19922943, 24068095]

cp's OEIS Frontend

A387410 Numbers k such that the odd part of (1+k) divides (1 + odd part of A048250(k)), where A048250 is sum of the squarefree divisors of n.

Table of values

List of values