136921

Appears in sequences

• Composite numbers not divisible by 5 which in base 5 contain their largest proper factor as a substring.at n=24A063889
• Eigentriangle of Catalan triangle A033184.at n=59A172380
• Triangle whose inverse has production matrix with general term (-1)^(n-k+1)*C(k+1, n-k+1).at n=48A172381