20330

Appears in sequences

• Coordination sequence for hexagonal close-packing.at n=44A007899
• Coordination sequence for 5-dimensional cubic lattice.at n=11A008413
• a(0) = 1, a(n) = 42*n^2 + 2 for n>0.at n=22A010023
• Number of points of L1 norm 11 in cubic lattice Z^n.at n=5A035605
• Triangle, read by rows, such that row n equals the inverse binomial transform of column n of the triangle A034870 of coefficients in successive powers of the trinomial (1+2*x+x^2), omitting leading zeros.at n=50A099605
• a(n) = 36*n^2 - 17*n + 2.at n=23A157265
• Total number of positive integers below 10^n requiring 2 positive cubes in their representation as sum of cubes.at n=6A181375
• a(n) = n*(14*n + 3).at n=38A195025
• Triangle of coefficients of polynomials u(n,x) jointly generated with A209142; see the Formula section.at n=49A209141
• Triangle of coefficients of polynomials u(n,x) jointly generated with A209746; see the Formula section.at n=50A209745
• Triangle of coefficients of polynomials u(n,x) jointly generated with A210754; see the Formula section.at n=50A210753
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^3<x^3+y^3.at n=32A211801
• Generalized Markoff numbers: largest number a in a 5-tuple a >= b >= c >= d >= e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 4*a*b*c*d*e.at n=15A229241
• Numbers k such that (185*10^k + 7)/3 is prime.at n=18A281911
• Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.at n=15A299182
• Larger of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=11A323330
• The number of edges formed by straight line segments mutually connecting all vertices of a semicircular polygon defined in A333642.at n=20A330911
• Numerator of the average distance among first n primes.at n=41A332094
• Number of ordered triples (a,b,c) of positive integers less than n with the property that n divides a*b*c.at n=53A352078