69829

Properties

Appears in sequences

• a(n) = A072637(A048679(n)).at n=55A072647
• Solve 2^n - 2 = 7(x^2 - x) + (y^2 - y) for (x,y) with x>0, y>0; sequence gives value of x.at n=34A076632
• Expansion of (1-x)^(-1)/(1-x+2*x^2).at n=32A077876
• Expansion of g.f.: (1+3*x^2)/((1-x)*(1+x+2*x^2)*(1-x+2*x^2)).at n=32A107443
• Expansion of g.f.: (1+3*x^2)/((1-x)*(1+x+2*x^2)*(1-x+2*x^2)).at n=33A107443
• Noncomposite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=19A168025
• Expansion of g.f. (1+3*x)/((1-x)*(1+3*x+4*x^2)).at n=16A174565
• Number of maximal matchings in the n-web graph.at n=10A287497
• Prime numbersat n=6922