1777447

Appears in sequences

• Numbers that are a product of distinct Mersenne primes (elements of A000668).at n=28A046528
• Sum of divisors of n, sigma(n) (A000203), is a power of number of divisors of n, d(n) (A000005).at n=18A051281
• Numbers n such that sigma(n) is a prime power (A025475).at n=29A065523
• Binomial transform of expansion of exp(2cosh(x)), A000807.at n=11A081562
• 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=19A254352
• Nonprime numbers k such that sum of the divisors of k is a power of 2.at n=21A254603
• a(n) is the largest number k such that sigma(k) = 2^n or 0 if no such k exists.at n=21A295043
• Sphenic numbers that are the product of Mersenne primes.at n=6A346138
• Irregular table read by rows; the n-th row contains in ascending order the integers m > 1 such that sigma(m) = tau(m)^n; the first row contains 1.at n=12A349838