16785409

Appears in sequences

• a(n) = (2^n + 1)^2.at n=12A028400
• Palindromic squares in base 16.at n=16A029734
• n in base 8 is a palindromic square.at n=26A029806
• Squares which are palindromes in base 4.at n=14A029987
• Squares whose digits can be arranged in increasing cyclic order - to form a substring of 123456789012345678901234567890...at n=27A068708
• Product of divisors of 2^n + 1.at n=11A069060
• Perfect powers (index > 1) whose digits can be arranged in ascending order or as a substring of 123456789012345678901234567890123...at n=31A076966
• a(2*n) = -(2^(2*n+1) + 1), a(2*n+1) = (2^(n+1) - (-1)^n)^2.at n=23A105951
• a(2n) = 2*4^n-1, a(2n+1) = (2^(n+1)+1)^2; interlaces A083420 with A028400.at n=23A107663
• Corresponds to m = 9 in a family of 4th-order linear recurrence sequences given by a(m,n) = m^4*a(n-4) + (2*m)^2*a(n-3) - 4*a(m-1), a(m,0) = -1, a(m,1) = 4, a(m,2) = -13 + 6*(m-1) + 3*(m-1)^2, a(m,3) = (-8+m^2)^2.at n=7A113255
• Maximum number of rational points on a smooth absolutely irreducible projective curve of genus 1 over the field F_2^n.at n=23A169872
• a(n) = 1+4^(n+1)-4*(-2)^n.at n=11A171590
• 1/4 the number of (n+1) X 2 binary arrays with all 2 X 2 subblock sums the same.at n=24A183978
• Squares which have one or more occurrences of exactly eight different digits.at n=10A235723
• Gaussian norm of 1+(1+i)^n.at n=24A238187
• Numbers k such that 2^psi(k) == -1 (mod k) where psi(k) = A001615(k).at n=25A291164
• Numbers in base 10 that are palindromic in bases 4, 8 and 16.at n=17A319609
• a(n) is the least perfect power > 2^n.at n=24A357751