3220807683

Appears in sequences

• Least k such that sigma(k)=m^n for some m>1.at n=31A063869
• Positions of records in A175432.at n=28A169981
• a(n) is the smallest number k such that sigma(k) = 2^n or 0 if no such k exists.at n=32A247956
• a(n) is the least composite x such that sigma(x) divides (x-1)^n but not (x-1)^(n-1), for n >= 2.at n=30A254352
• Sphenic numbers that are the product of Mersenne primes.at n=22A346138