197061

Appears in sequences

• Numbers k such that 4*R_k + 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=13A099414
• Number of (w,x,y,z) with all terms in {1,...,n} and w <= harmonic mean of {x,y,z}.at n=27A212104
• Number of nX5 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=10A280601