39759

Appears in sequences

• a(n) = T(n, n-2), T given by A026584. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=2.at n=12A026587
• a(n) = Sum_{k=0..2*n-2} T(n,k) * T(n,k+2), with T given by A026584.at n=5A027284
• Numbers k that divide the (left) concatenation of all numbers <= k written in base 16 (most significant digit on left).at n=14A029485
• Expansion of phi(x) / f(-x) in powers of x where phi(), f() are Ramanujan theta functions.at n=33A029552
• a(n) is the sum of all possible pairs of the first n primes.at n=27A162867
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 734", based on the 5-celled von Neumann neighborhood.at n=30A290212
• a(n) = [x^n] Product_{j=1..n, k=1..n} 1/(1 - x^(k^j)).at n=9A369577