25405

Appears in sequences

• Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.at n=18A048131
• Triangle of up-down sums of k-th powers: a(n,k)=sum(i^k,i=1..n)+sum((n-i)^k,i=1..n-1), n,k>0.at n=50A051672
• Number of (n+1) X 2 0..4 arrays with every 2 X 2 subblock summing to 8.at n=4A183644
• Number of (n+1) X 6 0..4 arrays with every 2 X 2 subblock summing to 8.at n=0A183648
• T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock summing to 8.at n=10A183652
• T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock summing to 8.at n=14A183652
• The sequence T_{3,1}(n,3).at n=13A372076