85683

Appears in sequences

• Numbers k that divide s(k), where s(1)=1, s(j)=3*s(j-1)+j.at n=6A014850
• Concatenation of the 5 prime factors of composite a(n) is a palindrome.at n=8A046454
• Numbers k such that (k+j) mod (2+j) = 1 for j from 0 to 8 and (k+9) mod 11 <> 1.at n=30A096026
• Numbers of the form (3^i)*(13^j).at n=31A107364
• Number of base 27 circular n-digit numbers with adjacent digits differing by 9 or less.at n=4A125484
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and positive odd determinant.at n=25A210373
• Number of 2 X 2 matrices having all terms in {1,...,n} and positive odd determinant.at n=25A211068
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y>=2z.at n=26A212505
• a(n) = 3*n^4.at n=13A219056
• Number of overpartitions of n minus the number of partitions of n.at n=29A230441
• Numbers k such that the k-th cyclotomic polynomial has a root mod 13.at n=26A245481
• Consider primitive pairs of integers (b, c) with b > 0 such that x^5 + b*x + c = 0 is irreducible and solvable by radicals: sequence gives values of c.at n=26A371554
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A052750.at n=41A384718
• sqrt(a(n)) / 4 is the maximum area of any triangle with integer side lengths whose perimeter is n, or a(n) = -1 if there is no such triangle.at n=39A387833