4862025

Appears in sequences

• Squares of odd heptagonal numbers.at n=15A014773
• n is odd and divisible by number of divisors of n and sum of digits of n.at n=27A057530
• Squares which remain squares if you increment every digit by 1.at n=4A061843
• Squares which remain squares when each digit is replaced by the next digit.at n=6A117755
• a(n) = Product_{k=1..n} (1 + 4*sin(2*Pi*k/n)^2).at n=16A152152
• Odd abundant numbers whose abundance is odd.at n=15A156942
• Number of nX7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=7A208554
• Numbers k such that phi(k)^phi(k) == 1 (mod sigma(k)).at n=27A248861
• Magic sums of 3 X 3 semimagic squares of squares whose rows, columns, and at least one of the two main diagonals sum to the same number.at n=20A271021
• Odd abundant numbers k for which sigma(k) == 3 (mod 4).at n=8A325311
• Squares that remain squares when the repunit with the same number of digits is added.at n=9A335598
• Odd numbers k such that sigma(k) > 2*k and A003415(sigma(k)) < k, where A003415 is the arithmetic derivative, and sigma is the sum of divisors function.at n=5A347890