2752491

Appears in sequences

• Numbers that are a product of distinct Mersenne primes (elements of A000668).at n=29A046528
• Least k such that sigma(k)=m^n for some m>1.at n=10A063869
• Least k such that sigma(k)=m^n for some m>1.at n=21A063869
• Numbers n such that sigma(n) is a prime power (A025475).at n=30A065523
• Smallest number m such that sigma(m) is an n-almost prime.at n=21A152092
• Positions of records in A175432.at n=18A169981
• 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=22A180162
• a(n) is the smallest number k such that sigma(k) = 2^n or 0 if no such k exists.at n=22A247956
• 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=20A254352
• Nonprime numbers k such that sum of the divisors of k is a power of 2.at n=22A254603
• Least k such that n divides d(sigma(k)) (d = A000005).at n=22A276043
• Sphenic numbers that are the product of Mersenne primes.at n=7A346138