50507

Appears in sequences

• Indices of primes at which the prime race 4k-1 vs. 4k+1 is tied.at n=31A038691
• Positive integers k such that k*3^k - 2 is prime.at n=16A182373
• Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).at n=4A208427
• Number of nX5 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).at n=4A208431
• T(n,k)=Number of nXk 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).at n=40A208434
• Number of 0..n arrays of length 3 with 0 never adjacent to n.at n=35A212836
• Numbers n such that phi(n) = 3*phi(n+1).at n=12A256907