84904

Appears in sequences

• Numbers n such that 237*2^n-1 is prime.at n=41A050877
• Numbers k such that 6*R_k - 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=28A098088
• Triangle, read by rows, T(n, k) = 1 - floor(n*(n-1)/4) + floor(binomial(n-1,k-1) * binomial(n, k-1)/(2*k)).at n=59A176125
• Triangle, read by rows, T(n, k) = 1 - floor(n*(n-1)/4) + floor(binomial(n-1,k-1) * binomial(n, k-1)/(2*k)).at n=61A176125
• a(n) = (3^(3*n + 3)- 26*n - 27)/169.at n=4A198080