28143

Appears in sequences

• Ratios of consecutive row products of triangle A094275.at n=9A094279
• Numbers n such that (n+j) mod (2+j) = 1 for j from 0 to 5 and (n+6) mod 8 <> 1.at n=33A096024
• A109912(n+1)/A109912(n).at n=12A109913
• Sum of the squares of the quadratic residues of prime(n).at n=16A125613
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k doubledescents (0 <= k <= n-2). We say that i is a doubledescent (also called a double fall) of a permutation p if p(i) > p(i+1) > p(i+2).at n=33A162975
• a(n) = a(n-no-1)+....+a(n-1)+(n-no-2) where no is the 'no+1'th order of the series and 'n' is the element number, here no=6.at n=19A196876
• Number of permutations of [n] having exactly three (possibly overlapping) doubledescents.at n=4A279292
• Number of nonnegative solutions to (x_1)^2 + (x_2)^2 + ... + (x_7)^2 <= n.at n=34A341402
• For 1<=x<=n, 1<=y<=n, write gcd(x,y) = u*x+v*y with u,v minimal; a(n) = n^4*s, where s is the population variance of the values of |u|.at n=11A345689