28886

Appears in sequences

• Numbers n such that n!3 + 3^10 is prime, where n!3 = n!!! is a triple factorial number (A007661).at n=28A261145
• Triangle read by rows: T(n,k) (0<=k<=n) given by T(n,0)=1, T(n,n) = binomial(2n,n); otherwise T(n,k) = T(n,k-1)+T(n-1,k).at n=61A274292
• Expansion of Product_{k>=1} 1/(1 - x^(k*(k+1)/2))^A072964(k).at n=37A321507
• a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(i*j*k) / phi(j*k).at n=15A372663