13340250

Appears in sequences

• a(n) is the smallest k such that psi(k) = n!, or 0 if no such k exists (psi(k) = A001615(k)).at n=11A291487
• Let M_n be the n X n matrix M_(i,j)=1/(i+j+i*j); a(n) is the denominator of det(M_n).at n=3A381371