19657

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 72 ones.at n=36A031840
• Number of 5-ary rooted trees with n nodes and height exactly 6.at n=15A036637
• a(n) = n^3 - n + 1.at n=27A061600
• The last number for which a determinant of base-n numbers is nonzero.at n=25A079505
• a(n) = 15*n^2 + 6*n + 1.at n=36A080861
• Triangle read by rows: T(n,k) (0 <= k <= floor(n/2)) is the number of lattice paths from (0,0) to (2n,0) consisting of steps U=(1,1), D=(1,-1), H=(2,0), never going below the x-axis (i.e., Schroeder paths) and having k UH's.at n=21A110220
• Expansion of (1-4x+12x^2-16x^3+8x^4)/(1-x)^5.at n=27A119327
• G.f.: 1/(1 - 7 x + 15 x^2 - 6 x^3 - 11 x^4 + 6 x^5 + x^6).at n=7A122611
• a(n) = 7^n + 5^n - 3^n - 2^n.at n=5A135165
• Partial sums of A151791.at n=33A151792
• Semiprimes which are the sum of three distinct positive cubes in two or more distinct ways.at n=27A180089
• Numbers k for which there are no prime numbers in the range (k-4*sqrt(sqrt(k)), k].at n=10A192320
• Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero.at n=6A208821
• T(n,k) is the number of n-bead necklaces labeled with numbers -k..k allowing reversal, with sum zero.at n=51A208825
• Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.at n=3A208828
• a(n) = 4*n^3 + 5.at n=18A243762
• Records in A098550.at n=43A248647
• Number of compositions of n such that no part equals any of its two immediate predecessors.at n=22A261962
• Where record values occur in A276781, when starting from A276781(2)=1.at n=48A276782
• Number of cyclic subgroups of the group C_n x C_n x C_n x C_n, where C_n is the cyclic group of order n.at n=24A280184