52080

Appears in sequences

• Triangle T(n,k) (0 <= k <= n) giving number of chains of length k in partially ordered set formed from subsets of n-set by inclusion.at n=33A038719
• Numbers that can be expressed as the difference of the squares of primes in exactly seven distinct ways.at n=13A092003
• Bases of right triangles that are solutions to Leech's problem A117319.at n=19A117320
• Determinant of n-th continuous block of 4 consecutive squares of primes.at n=6A118873
• Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 5 fixed elements.at n=2A126232
• Numbers n such that phi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.at n=27A139408
• a(n) = ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 4.at n=39A160892
• Triangular array T(n,k): functions f:{1,2,...,n}-> {1,2,...,n} such that each of k fixed (but arbitrary) elements are in the image of f.at n=33A174551
• Numbers with prime factorization p*q*r*s*t^4 (where p, q, r, s, t are distinct primes).at n=10A190110
• Places n such that the two remainders A187680(n) and A191906(n) are both zero.at n=22A192853
• Triangle T(n,k), n>=0, 0<=k<=2n, read by rows: row n gives the coefficients of the chromatic polynomial of the complete bipartite graph K_(n,n), highest powers first.at n=40A212084
• Number of (w,x,y,z) with all terms in {0,...,n} and at least one of these conditions holds: w=R, x=R, y<R, z<R, where R = max{w,x,y,z} - min{w,x,y,z}.at n=15A212750
• Sigma(n) values in A115920.at n=22A216372
• Number of additive Z_2 Z_8 codes of a certain type (see Siap-Aydogdu for precise definition).at n=1A226268
• Triangle T(n, k) = Number of ways to arrange k indistinguishable points on an n X n square grid so that no four of them are vertices of a square of any orientation.at n=29A240444
• Numbers of ways to place five indistinguishable points on an n X n square grid so that no four of them are vertices of a square of any orientation.at n=2A240445
• Number of integers k^5 that divide 1!*2!*3!*...*n!.at n=18A248823
• Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments.at n=32A249253
• Least common multiple of all n - d, where d < n and d is a divisor of n.at n=31A258324
• Fifth differences of 7th powers (A001015).at n=6A259907