3670009
domain: N
Appears in sequences
- Numbers that are a product of distinct Mersenne primes (elements of A000668).at n=31A046528
- Sum of divisors of n, sigma(n) (A000203), is a power of number of divisors of n, d(n) (A000005).at n=19A051281
- Numbers n such that sigma(n) is a prime power (A025475).at n=32A065523
- Semiprimes that are a product of Mersenne primes.at n=17A144482
- Semiprimes that are a product of distinct Mersenne primes.at n=13A144856
- Partial sums of A162396.at n=37A164120
- Number of idempotent n X n 0..7 matrices of rank n-1.at n=6A224332
- Number of idempotent 7 X 7 0..n matrices of rank 6.at n=6A224338
- Nonprime numbers k such that sum of the divisors of k is a power of 2.at n=24A254603
- 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=10A349006