19149

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 92.at n=33A031590
• Sorted elements of table (A035002) of a(m,n) = sum(a(m-k,n), k=1..m-1)+sum(a(m,n-k), k=1..n-1).at n=43A035001
• Odd terms of A059756.at n=18A111042
• a(n) = (2*n^3 + 5*n^2 - 9*n)/2.at n=25A162258
• Least k such that k*30^n-1 , k*30^n+1, and 2*k*30^n-1 are prime; that is, twin primes and a Sophie Germain prime.at n=25A212956
• Number of (n+3)X(4+3) 0..1 arrays with each row and column divisible by 9, read as a binary number with top and left being the most significant bits.at n=3A262336
• T(n,k)=Number of (n+3)X(k+3) 0..1 arrays with each row and column divisible by 9, read as a binary number with top and left being the most significant bits.at n=24A262338
• Number of polygon edges formed by infinite lines when connecting all vertices and all points that divide the sides of an equilateral triangle into n equal parts.at n=7A344896
• Table read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives number of edges in the resulting planar graph.at n=24A367190
• The number of irreducible zero-sum subsets of {-n..n} that contain -n but not n.at n=20A390082