54999

Appears in sequences

• a(1) = 4; a(n) = average of the largest and the smallest n-digit primes.at n=4A073863
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=2, I={0,1}.at n=37A080013
• Triangle T(n,k) = 10^(n-1) -1 + k*floor(9*10^(n-1)/(n+1)), with 1 <= r <= n, read by rows.at n=12A093850
• Arithmetic mean of all n-digit positive even numbers.at n=4A110430
• Integers of the form 8k + 7 that can be written as a sum of four distinct squares of the form m, m + 2, m + 3, m + 4, where m == 2 (mod 4).at n=28A243581