28609

Appears in sequences

• a(n) = 5^n mod 2^n.at n=16A029757
• Numbers that are the product of 3 prime factors whose concatenation is a palindrome.at n=41A046452
• Numbers n with property that n^2 starts and ends with 81.at n=9A159775
• Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.at n=13A297734
• Replacing each digit d in decimal expansion of n with d^2 yields a prime at each step when done recursively three times.at n=26A316604