50898

Appears in sequences

• a(n) = n^4 + (9/2)*n^3 + n^2 - (9/2)*n + 1.at n=14A003878
• a(0)=1, a(1)=0, a(2)=2, a(3)=1, a(n)=a(n-2)+a(n-3)+a(n-4) for n>3.at n=30A167704
• Constant term in the reduction of the polynomial 1+x+x^2+...+x^n by x^3->x^2+2x+1. See Comments.at n=17A192805
• Composite numbers n such that n+2 is also composite and such that (sopfr(n), sopfr(n+2)) is a twin prime pair. A001414 explains notation 'sopfr(n)'.at n=5A247048