24457

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=15A011948
• Numbers k such that the continued fraction for sqrt(k) has period 81.at n=25A020420
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 28.at n=4A031616
• Number of partitions of n into parts not of the form 23k, 23k+11 or 23k-11. Also number of partitions with at most 10 parts of size 1 and differences between parts at distance 10 are greater than 1.at n=39A035999
• Determinant of n X n matrix whose rows are cyclic permutations of 4..Composite(n).at n=4A066917
• Scale factor by which primitive Pythagorean triangle {x=A088509(n), y=A088510(n), z=A088511(n)} needs be enlarged in order to circumscribe the smallest integral square having a side on the hypotenuse.at n=19A088544
• a(n) = 2*L(n) + L(n-1) - n, L(n) = n-th Lucas number A000204(n).at n=18A133641
• a(1) = greatest k such that H(k) - H(6) < H(6) - H(3); a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(6), and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.at n=8A227816
• a(n) = 2*a(n-1) - a(n-2) + a(n-3) - a(n-4), where a(0) = 2, a(1) = 4, a(2) = 5, a(3) = 6.at n=25A288429
• Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.at n=21A308706
• Number of n-bead bracelet structures using exactly two different colored beads that are not self-equivalent under either a nonzero rotation or reversal (turning over bracelet).at n=20A327734
• Number of partitions of n with rank a multiple of 6.at n=47A363238