268173312
domain: N
Appears in sequences
- a(n) = 4^(n-1)*(2^n-1).at n=10A016152
- Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,8)-perfect numbers.at n=17A019285
- a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 11.at n=7A160957
- a(n) = 2^n - 2^floor(2n/3).at n=28A291779