58520

Appears in sequences

• Treated as strings, phi(n) is a substring of sigma(n).at n=30A074452
• Expansion of 1/((1-x)*(1+x+2*x^2-2*x^3)).at n=21A077910
• Numbers k such that phi(k)*sigma(k) is a cube.at n=19A114077
• n times the n-th n-gonal number.at n=19A117665
• Triangle read by rows: T(n,k) is the number of non-crossing connected graphs on n nodes on a circle having root (a distinguished node) of degree 1 and having k edges (n >= 2, 1 <= k <= 2n-4).at n=52A143024
• a(n) = 121*n^2 - 2*n.at n=21A157040
• Numbers n such that product of double factorials of the digits of n equals sigma(n).at n=15A158989
• a(n) = n*(n+1)*(n+2)*(n+3)/3.at n=19A162668
• Numbers n such that sigma(n) = 10*phi(n) (where sigma=A000203, phi=A000010).at n=11A171256
• Number of strings of numbers x(i=1..5) in 0..n with sum i^2*x(i) equal to n*25.at n=33A183956
• Table of coefficients of a polynomial sequence related to the Springer numbers.at n=31A185417
• (Denominators of Cauchy numbers of the first kind c_{2n})/6.at n=26A222560
• (Denominators of Cauchy numbers of the second kind hat c_{2n})/6.at n=26A222561
• a(n) = 2*A000447(n).at n=28A259110
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 545", based on the 5-celled von Neumann neighborhood.at n=38A272836
• Triangle lc(n,k): the number of purely line-connected k-partitions of [n], n>=4, 3<=k<n.at n=29A305874
• Sum of all the parts in the partitions of n into 6 parts.at n=38A308867
• a(n) is the least number that has exactly n divisors with sum of digits n.at n=9A359444