28557

Appears in sequences

• (s(n)+s(n+1))/18, where s()=A006521.at n=27A016060
• a(n) = smallest k such that the digit sum of 7k is n.at n=43A077494
• a(n) = (4*n+3)*(4*n+7).at n=41A085027
• Partial sums of A001652.at n=6A089950
• Triangle read by rows: T(n,k) is the number of Schroeder paths of length 2n having trapezoid weight k.at n=51A104552
• Numbers n such that 2^(n+1)+2n+1 is prime.at n=34A105330
• G.f. satisfies: A(x) = (1 + x*A(x)) * (1 + x^2*A(x))^2.at n=11A218250
• Number of primitive binary words of length n that avoid 11, start with 1 and end with 0.at n=23A381936
• Numbers k such that k - A067666(k) is a square.at n=48A386304