27398

Appears in sequences

• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=24A112818
• Integers n > 1 such that A130280(4n^2) < n, i.e., there is an m < n, m > 1 such that 4n^2(m^2 - 1) + 1 is a square.at n=21A130281
• Number of (w,x,y) with all terms in {0,...,n} and even range.at n=37A212975
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 173", based on the 5-celled von Neumann neighborhood.at n=34A270467
• Sum_{n>=0} a(n) * x^n / (n!)^2 = exp(-x) * BesselI(0,2*sqrt(x))^2.at n=9A336634
• Number of odd-length integer partitions of n with integer alternating product.at n=51A347444
• Least b > 1 such that (b^(prime(n)^2) - 1)/(b^prime(n) - 1) is prime.at n=45A353101
• The five digits of a(n) and their four successive absolute first differences are all distinct.at n=11A365257
• a(n) = Sum_{k=0..n} binomial(4*n+3*k,n-k).at n=5A390409