127140

Appears in sequences

• Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1 and 32n-1 are primes.at n=13A124017
• Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape L; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=50A247704
• Number of length n+3 0..3 arrays with at most one downstep in every n consecutive neighbor pairs.at n=10A258733
• Numbers k such that k*A001414(k)+1 is the square of a prime.at n=44A343141