161121

Appears in sequences

• Discriminants of totally real quintic fields.at n=24A023683
• Numbers whose sum of digits s equals its product of digits and s + 1 and s - 1 are both prime.at n=26A061597
• Number of 2-trees rooted at any symmetric edge.at n=19A063687
• Number of (7+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=18A252391