1121931

Appears in sequences

• Pseudo-powers to base 3: numbers k that are not powers of 3 such that k divides 2^k + 1.at n=29A016057
• The third of the three sequences associated with the polynomial x^3 - 2.at n=19A052103
• a(n) = 3*a(n-1) + 18*a(n-2), a(0)=0, a(1)=1.at n=9A080424
• Expansion of (1+27x^2-54x^3)/((1+3x)^2*(1-3x+9 x^2)).at n=10A168075
• a(n) = 19*3^n.at n=10A176413
• a(n) = (n/4)*3^(n/2)*((1+sqrt(3))^2+(-1)^n*(1-sqrt(3))^2).at n=19A187273
• Lexicographically least strictly increasing sequence such that, for any n>0, Sum_{k=1..n} a(k) can be computed without carries in base 9 (the numbers are written in base 10).at n=26A280731
• Terms k of A006521 such that 2*k is a term of A124240.at n=38A289257