227474

Appears in sequences

• Numbers n such that pi(n)=10^pi(d_1)+10^pi(d_2)+...+10^pi(d_k) where d_1d_2...d_k is the decimal expansion of n.at n=1A139411
• Alternating sum of Motzkin numbers A001006.at n=15A187306
• Number of (w,x,y,z) with all terms in {0,...,n} and even range.at n=25A212889