1398273429
domain: N
Appears in sequences
- Least k such that sigma(k)=m^n for some m>1.at n=30A063869
- Positions of records in A175432.at n=27A169981
- a(n) is the smallest number N such that sigma(N) is an n-th power but not a higher power, with a(n) = 0 if no such number exists.at n=31A180162
- a(n) is the smallest number k such that sigma(k) = 2^n or 0 if no such k exists.at n=31A247956