23414

Appears in sequences

• Coordination sequence for MgCu2, Cu position.at n=38A009930
• a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n+1-k), where k = [ (n+1)/2 ], p = A000040 = the primes.at n=29A024697
• a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n-k+1), where k = [ n/2 ], p = A000040, the primes.at n=29A025129
• Numbers k such that 4*10^k + 6*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=27A099005
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 659", based on the 5-celled von Neumann neighborhood.at n=25A273386
• Twice partitioned numbers where the latter partitions are constant.at n=19A279784
• G.f. satisfies A(x) = 1 / (1 - x^3*A(x)^3 / (1 - x)).at n=17A376490