28168

Appears in sequences

• a(n) is the concatenation of n and 6n.at n=27A009440
• Numbers k such that k^2+k+5 is a palindrome.at n=17A027718
• a(n) = 36*n^2 - 2*n.at n=27A158062
• Number of (w,x,y,z) with all terms in {1,...,n} and w >= |x-y| + |y-z|.at n=16A212675
• Primitive integer length of the side of an origin-centered square that contains inside its boundary a point with integer coordinates that is an integer distance from three of the four corners.at n=20A215365
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=30A259003
• Primitive values n such that the square with opposite corners (0,0) and (n,n) contains a point (x,y) with integer coordinates, with 0 < x,y < n, at an integer distance from three of the four corners.at n=38A260549
• G.f.: Product_{k>=1, j>=1} 1/(1 - x^(j*k^3)).at n=37A280661
• Number of permutations p of [n] such that | |p(i) - p(i-1)| - |p(i+1) - p(i)| | = 1.at n=21A338766