114242

Appears in sequences

• Numbers k such that sigma(k)*phi(k) is squarefree.at n=28A065299
• Numbers k such that 2*k*(k+2) is a square.at n=7A082639
• a(2n) = A002315(n), a(2n+1) = A082639(n+1).at n=13A113224
• Number of (v,w,x,y,z) with all terms in {0,1,...,n} and v=average(w,x,y,z).at n=25A212257
• 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=12A213667
• 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=13A228797
• Row sums of triangle in A152719.at n=25A238375
• Expansion of (x^4+x^3-x^2+x)/(x^3+x^2-3*x+1).at n=14A265278
• Expansion of 2*x^2 / (x^3 + x^2 - 3x + 1).at n=14A293004
• Numbers k such that phi(k) == 2 (mod 12), where phi is the Euler totient function (A000010).at n=33A332511
• Numbers k such that 2+k and 2*k are squares.at n=3A383734