50727domain: NAppears in sequencesa(n) = Sum_{d|3} phi(d)*n^(3/d).at n=37A054602a(n) = floor(1/(Pi - 2^(n+1)*sin(Pi/2^(n+1)))).at n=7A248347Numbers k such that 3*10^k - 31 is prime.at n=20A293842Number of ways to split a strict composition of n into contiguous subsequences all having the same sum.at n=30A336130