19846

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=17A031848
• Semiprimes in A056109.at n=37A113528
• Number of permutations in S_n avoiding {bar 5}1243 (i.e., every occurrence of 1243 is contained in an occurrence of a 51243).at n=8A137547
• Ulam's spiral (SSE spoke).at n=35A143839
• Augmentation of the triangular array P=A094727 given by p(n,k)=n+k+1 for 0<=k<=n. See Comments.at n=19A193093
• a(0) = 1; for n > 0, a(n) = 41*n^2 + 2.at n=22A206399
• Semiprimes of the form 5*n^2 + 1.at n=20A212707
• Sum of cubes of proper divisors of n.at n=51A276634
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. exp(k*x)*(BesselI(0,2*x) + BesselI(1,2*x)).at n=71A292630
• Numbers k such that k = x^2+y^2+z^2 = x^3+y^3+z^3 for some integers x,y,z.at n=12A336240
• Total number of weak ascents in all length-n weak ascent sequences.at n=7A369476
• Square array: T(n,k) = ((3^(n+1) + 1)^(k-1) + 2)/3, read by descending antidiagonals.at n=18A374258