149788

Appears in sequences

• Number of 6-cycles in the n X n knight graph.at n=36A289181
• Expansion of a q-series used by Ramanujan in his Lost Notebook.at n=24A292445
• a(n) is the sum of the terms of the symmetric square array defined by M(i,j) = prime(i)+i-j for i >= j and M(i,j) = M(j,i) if i < j.at n=36A308731
• Numbers k such that for some r we have phi(1) + ... + phi(k - 1) = phi(k + 1) + ... + phi(k + r), where phi(i) = A000010(i).at n=18A358936