83840

Appears in sequences

• The smallest k such that the number of steps in the n Collatz sequences starting at k+i, i=0..n-1, is always prime.at n=27A174538
• Number of (5+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=9A252537