28015

Appears in sequences

• Numerator of n*(n-3)*(3*n^2-6*n+2)/(3*(n-1)*(n-2)).at n=10A023417
• Numbers n such that phi((prime(n)+1)/2)=sigma(n).at n=40A068473
• Expansion of x*(1-2*x)/((1-x)*(1+2*x)*(1-6*x)).at n=7A091055
• a(n) = 2 + floor((1 + Sum_{j=1..n-1} a(j))/4).at n=43A120161