102229

Properties

Appears in sequences

• Triangle read by rows: T(n,k) = n*T(n-1,k) + n - k starting at T(n,n)=0.at n=47A081114
• Total number of perfect powers > 1 below 10^n.at n=9A089579
• Prime numbers containing the string 222.at n=22A166580
• a(n) = Sum_{k=0..n} binomial(n+k-1,k) * binomial(2*n+2*k-1,n-k).at n=6A378461
• Prime numbersat n=9791