218644

Appears in sequences

• Expansion of (1-x)^2/((1-x)^3 - 3*x^3).at n=15A097122
• Numbers k such that 2*10^k + 3*R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=21A102951