39996

Appears in sequences

• Number of ways to color vertices of a heptagon using <= n colors, allowing only rotations.at n=6A054621
• Number of n-bead necklaces with 6 colors.at n=7A054625
• Triangle read by rows: row n (n >= 1) contains the numbers T(n,k) = Sum_{d|n} phi(d)*k^(n/d)/n, for k=1..n.at n=26A054631
• Harmonic mean of digits is 6.at n=27A062184
• Triangle T(n,k) (n>=1, rows have irregular lengths) giving number of arrangements of k nonattacking princes on an n X n staggered hexagonal torus board.at n=26A067015
• Numbers n such that 2n+1 is the digit reversal of n+1.at n=3A083811
• a(n) = 4*(10^n - 1).at n=4A086575
• n times largest n-digit number.at n=4A110807
• Take an n X n square grid of points in the plane; a(n) = number of non-isomorphic ways to divide the points into two sets using a straight line.at n=31A116696
• Numbers which can be expressed as the product of numbers made of only sixs.at n=16A161144
• Table read by antidiagonals: T(n,k) = number of distinct n X k toroidal 0..5 arrays.at n=21A184291
• Table read by antidiagonals: T(n,k) = number of distinct n X k toroidal 0..5 arrays.at n=27A184291
• Indices of records in A004290.at n=20A268610
• Triangle read by rows: T(p_1,p_2) = maximal period of a decimal fraction (r/s)*(t/u) given that r/s has period p_1 and t/u has period p_2 (1 <= p_1 <= p_2).at n=9A278588
• Number of 4-cycles in the n X n rook graph.at n=11A288962
• Number of parts in all partitions of n with largest multiplicity five.at n=34A320375
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=16A327323
• a(n) is the smallest number whose divisors include exactly n that can be written in the form m + reverse(m), for some m (A067030).at n=29A358513