20861

Appears in sequences

• Total number of nonprime parts in all partitions of n.at n=27A144119
• Number of solutions to p(n) = Sum_{i=1..n-1} c(i)*p(i) with c(i) in {-1,0,1} and p(n) = n-th prime.at n=14A215221
• Number of solutions to n = Sum_{i=1..pi(n-1)} c(i)*p(i) with c(i) in {-1,0,1}, p(n) = n-th prime and pi = A000720.at n=46A215222
• a(n) = 1 + n + ((n-1)*n^2)/2.at n=35A218152
• a(n) = 2 + n^2*floor((n+3)/2) + floor(3*n/2).at n=33A370754