135878

Appears in sequences

• Numbers k such that 70*R_k + 9 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=10A056693
• a(n) = sum of absolute values of coefficients of (1 + x - 2*x^2)^n.at n=10A084613
• Number of length 6+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=16A248543