448751

Appears in sequences

• Concatenation of first 3 digits and last 3 digits of n-th Mersenne prime A000668(n).at n=24A138866
• a(n) = Sum_{k = 0..n-1} binomial(n,k)^2*binomial(n+k,k)*binomial(n+k-1,k).at n=5A361712
• a(0) = 1; a(n+1) = 10*a(n) + (a(n)-1 mod 9) + 1, or the least number not yet in the sequence in case a(n) is a multiple of 3 or a prime.at n=9A375102