57521883

Appears in sequences

• Base-2 digits are, in order, the first n terms of the periodic sequence with initial period [1,1,0].at n=26A033129
• a(n) = Sum_{1<=k<=n, gcd(k,n)=1} 2^(k-1).at n=26A054432
• Expansion of (1 - x)/(1 + x - x^2 + 2*x^3).at n=26A078043
• a(n) = (8^n - 1)*3/7.at n=9A083713
• a(n) = Sum[2^(A001651(i-1)-1), {i,1,n}].at n=17A113836
• Expansion of x*(1 + x)/((1-2*x)*(1+x+x^2)).at n=27A294627