86691

Appears in sequences

• Numbers n such that sigma(reverse(n)) = phi(n).at n=24A070856
• Numbers n such that 379*10^n+9 is a ("Google") probable prime.at n=23A159264
• Number of (n+1)X(3+1) 0..2 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=1A235781
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=7A235784
• Number of (2+1)X(n+1) 0..2 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=2A235785