191817

Appears in sequences

• Describe the n-th Fibonacci number A000045(n).at n=16A045988
• Numbers whose decimal expansion is a concatenation of 3 consecutive decreasing numbers.at n=17A127424
• Generating function A(5,t)(1+t+t^2)/(1-t)^6, where A(5,t) is an Eulerian polynomial.at n=9A179995
• Twin prime pairs concatenated to their average in decimal representation (the greater twin prepended, the lesser appended).at n=3A268146