19281

Appears in sequences

• Expansion of 1/(1-x^3-x^4-x^5-x^6).at n=35A017819
• a(n) = Sum_{k=0..floor(n/2)} A027157(n-k, k).at n=16A027167
• 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=38A031590
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 72 ones.at n=35A031840
• Semiprimes in A056108.at n=22A113527
• a(n) = 12*n^2 + 2*n + 1.at n=40A194454
• Number of (w,x,y,z) with all terms in {1,...,n} and 2w=x+y+z.at n=36A212068
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 425", based on the 5-celled von Neumann neighborhood.at n=32A272091