1258884

Appears in sequences

• Number of ways to place a non-attacking white and black rook on n X n chessboard.at n=33A035287
• Squares k^2 such that reverse(k)^2 = reverse(k^2), excluding squares of palindromes.at n=28A064021
• Replace all prime factors p of n with n-p.at n=35A072194
• Coefficients of power series A(x) consist entirely of squares, where A(x) = A083352(x)^2 + A083352(x) - 1.at n=40A083353
• Numbers k such that sigma(k) + phi(k) is a brilliant number (A078972).at n=30A115916
• Perfect squares with property that their digit reversal is a larger perfect square.at n=21A156316
• Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=17A190377
• a(n) is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=15A340662