4294434817

Appears in sequences

• Sum of divisors of n, sigma(n) (A000203), is a power of number of divisors of n, d(n) (A000005).at n=33A051281
• Semiprimes that are a product of Mersenne primes.at n=24A144482
• Semiprimes that are a product of distinct Mersenne primes.at n=19A144856
• Numbers n with the property that there are integers k, h such that sigma(n) = k^tau(n) = tau(n)^h.at n=12A225362
• a(n) is the largest number k such that sigma(k) = 2^n or 0 if no such k exists.at n=32A295043
• a(1) = 1; for n > 1, a(n) is the smallest number m such that sigma(m) = tau(m)^n or 0 if no such m exists.at n=15A349006