7281799

Appears in sequences

• Numbers that are a product of distinct Mersenne primes (elements of A000668).at n=34A046528
• 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=21A254352
• Nonprime numbers k such that sum of the divisors of k is a power of 2.at n=27A254603
• a(n) is the largest number k such that sigma(k) = 2^n or 0 if no such k exists.at n=23A295043
• Sphenic numbers that are the product of Mersenne primes.at n=9A346138