51706

Appears in sequences

• Numbers k such that sigma(phi(k)) = sigma(k) where sigma is the sum of divisors function A000203 and phi is the Euler totient function A000010.at n=14A033631
• Number of nX5 binary arrays with no element equal to the mod 3 sum of its king-move neighbors.at n=6A183378
• T(n,k)=Number of nXk binary arrays with no element equal to the mod 3 sum of its king-move neighbors.at n=59A183380
• Number of partitions p of n such that (number of even numbers in p) < (number of odd numbers in p).at n=46A241636
• Number of ways to tile a 1 X n strip using squares, red dominos, and blue dominos, where the number of red dominos must be twice the number of blues.at n=20A383952