18665

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 59.at n=28A020398
• a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.at n=39A025001
• Numbers n such that 6*p(n)-1 and 6*p(n)+1 are twin primes and 6*p(n+1)-1 and 6*p(n+1)+1 are also twin primes with p(n) = n-th prime.at n=25A126655
• a(n) = Sum_{i=0..n} digsum_9(i)^3, where digsum_9(i) = A053830(i).at n=49A231686
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 563", based on the 5-celled von Neumann neighborhood.at n=16A283046
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384749.at n=49A384751
• Number of integer compositions of n that are the first sums of more than one composition.at n=34A391628