34051

Appears in sequences

• a(1) = 3, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).at n=6A063269
• Sum(j=1,n,floor(A000041(j)/j)).at n=50A086736
• a(1)=a(2)=1, a(n) = ceiling(Pi*a(n-1) - a(n-2)), n>2.at n=11A258911
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 517", based on the 5-celled von Neumann neighborhood.at n=32A272732
• Expansion of (1/x) * Series_Reversion( x * (1-x)^3 / B(x) ), where B(x) is the g.f. of A002293.at n=5A381916