210140

Appears in sequences

• Starting positions of strings of four 9's in the decimal expansion of Pi.at n=24A083643
• Number of permutations p of (1,2,...,n) such that 1+k+p(k) is prime for all k=1,2,...,n.at n=14A103687
• Triangle read by rows where T(n,k) is the number of labeled simple graphs with n vertices and vertex-connectivity k.at n=31A327334