1076768

Appears in sequences

• Coordination sequence for diamond structure D^+_6. (Edges defined by l_1 norm = 1.)at n=21A035879
• If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 5-subsets of X containing none of X_i, (i=1,...n).at n=18A130811
• a(n) is the least number such that phi(a(n)) = phi(R(a(n)))/n, where R(n) is the digit reverse of n and phi(n) is the Euler totient function of n.at n=19A284497