603460

Appears in sequences

• Numbers k for which phi(k) = phi(k+1) - phi(k-1).at n=36A076529
• Sum of the numerators for computing the second moment of the probability mass function (PMF) of the number of 2-cycles in the involutions on n elements (A000085) assuming the involutions are all equally likely.at n=10A174764
• Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.at n=7A252050