40191

Appears in sequences

• Base-9 palindromes that start with 6.at n=30A043033
• Numbers n such that 4*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=14A102982
• Natural growth of an aliquot sequence driven by a perfect number 2^(p-1)*((2^p) - 1).at n=23A146556
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 133", based on the 5-celled von Neumann neighborhood.at n=15A286021
• a(1) = 1; a(n+1) = Sum_{d|n} tau(d)*a(d), where tau = number of divisors (A000005).at n=11A307793
• Expansion of (g/(1 - x*g^2))^2, where g = 1+x*g^4 is the g.f. of A002293.at n=6A391199