111456
domain: N
Appears in sequences
- A convolution triangle of numbers obtained from A025748.at n=29A048966
- Sum of the divisors of 2^n - 1.at n=15A075708
- Number of 6-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=33A186982
- Numbers with prime factorization pq^4r^5.at n=19A190468
- a(0) = 0, a(1) = 1, for n > 1, a(n) = 2^n - (sigma((2^n)-1) - sigma((2^(n-1))-1)).at n=17A329891
- Sum of the divisors of 4^n-1.at n=7A366603
- Primitive terms of A388022: numbers k that satisfy sigma(k) AND 3*k = 3*k, but none of whose proper divisors satisfy the same condition.at n=26A388025