81576

Appears in sequences

• Numbers k such that 247*2^k+1 is prime.at n=28A032500
• Numbers k such that sopfr(k) = sopf(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=38A064675
• Number of cyclic whist (or bridge) tournaments with n tables of 4 players.at n=5A114959
• Number of reduced 3 X 3 semimagic squares with magic sum n.at n=34A173728
• Number of (undirected) paths in the n X n queen graph.at n=2A291995
• Number of 5-cycles in the n-polygon diagonal intersection graph.at n=41A300553