665856

Appears in sequences

• Squares of tetrahedral numbers: a(n) = binomial(n+3,n)^2.at n=15A001249
• Squares of even tetrahedral numbers (A015220).at n=12A014796
• Numbers k such that the numerator of Sum_{d|k} 1/d > 3*k.at n=27A069096
• Squares which are the product of a non-palindrome and its reversal, where leading zeros are not allowed.at n=4A076750
• Squares whose decimal digits are nonsquares (2, 3, 5, 6, 7, 8).at n=34A077437
• Numbers k such that 2*k*(k+2) is a square.at n=8A082639
• Coefficients of power series A(x) consist entirely of squares, where A(x) = A083352(x)^2 + A083352(x) - 1.at n=36A083353
• Initial terms of chains consisting of four consecutive integers, for none of which is the value of sigma-function divisible by six.at n=24A097020
• a(2n) = A002315(n), a(2n+1) = A082639(n+1).at n=15A113224
• Squares whose decimal representation contains no proper subsequence which is a positive square.at n=9A130448
• a(n) = A000931(n)^2.at n=30A133037
• Numbers k such that k^k == 1 (mod sigma(k)).at n=30A181476
• Number of dominating subsets with k vertices in all the graphs G(n) (n>=1) obtained by taking n copies of the path P_3 and identifying one of their endpoints (a star with n branches of length 2).at n=14A213667
• Composite numbers whose number of proper divisors has a number of proper divisors which has a prime number of proper divisors.at n=20A223457
• Number of 2 X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.at n=15A228797
• Squares that do not contain a shorter substring that is a square.at n=13A238334
• Row sums of triangle in A152719.at n=29A238375
• Numbers k such that phi(k)^phi(k) == 1 (mod sigma(k)).at n=18A248861
• Expansion of (x^4+x^3-x^2+x)/(x^3+x^2-3*x+1).at n=16A265278
• Solutions y to the negative Pell equation y^2 = 72*x^2 - 1331712 with x,y >= 0.at n=12A281242