53846

Appears in sequences

• a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-3*k, n).at n=9A105872
• Composite squarefree numbers n such that p(i)-10 divides n+10, where p(i) are the prime factors of n.at n=34A225710
• Products k of 4 distinct primes (or tetraprimes) such that none of k-2, k-1, k+1 and k+2 is squarefree.at n=37A364766
• a(n) = Sum_{i=0..floor(q(n)/3)} binomial(n-3*(i+1), q(n)-3*i) with q(n) = ceiling((n-3)/2).at n=18A366107