33112

Appears in sequences

• a(n+1) = a(n)-th composite number, with a(0) = 1.at n=43A006508
• E.g.f.: exp(x*exp(x*exp(x*exp(x*exp(x)))) + 1/2*x^2*exp(x*exp(x*exp(x*exp(x))))^2).at n=6A060912
• a(n) is the sum of all positive integers whose Collatz orbit has length n.at n=15A337673
• Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 2 + 4*x, p(n,x) = u*p(n-1,x) + v*p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - 2*x - x^2.at n=34A367298