205370

Appears in sequences

• Numbers k such that 161*2^k-1 is prime.at n=26A050832
• Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7.at n=13A252300