A320026 - cp's OEIS frontend

A320026 Odd squarefree numbers k for which m >= 0 can be found such that k2^m divides sigma(k2^m).

n	a(n)
1	1
2	3
3	7
4	15
5	21
6	31
7	127
8	1023
9	8191
10	131071
11	180213
12	524287
13	1796165
14	3112865
15	5388495
16	9338595
17	2147483647
18	2305843009213693951
19	618970019642690137449562111
20	162259276829213363391578010288127
21	170141183460469231731687303715884105727

[1, 3, 7, 15, 21, 31, 127, 1023, 8191, 131071, 180213, 524287, 1796165, 3112865, 5388495, 9338595, 2147483647, 2305843009213693951, 618970019642690137449562111, 162259276829213363391578010288127, 170141183460469231731687303715884105727]

cp's OEIS Frontend

A320026 Odd squarefree numbers k for which m >= 0 can be found such that k2^m divides sigma(k2^m).

Table of values

List of values

cp's OEIS Frontend

A320026 Odd squarefree numbers k for which m >= 0 can be found such that k*2^m divides sigma(k*2^m).

Table of values

List of values

A320026 Odd squarefree numbers k for which m >= 0 can be found such that k2^m divides sigma(k2^m).