70686

Appears in sequences

• a(n) = floor(n(n-1)(n-2)(n-3)/20).at n=36A011930
• Multiplicity of highest weight (or singular) vectors associated with character chi_155 of Monster module.at n=41A034543
• 1 / min{1/n - 1/a - 1/b > 0}, where a and b are integers.at n=21A045470
• Numbers k such that both k and 2*k are balanced numbers (A020492).at n=35A076375
• Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=16A076376
• Numbers whose number of divisors equals the sum of their separate prime-power decompositions.at n=25A087004
• Numbers k for which the quotient q(k)=(k+rev(k))/abs(k-rev(k)) is an integer.at n=28A087993
• Numbers n such that sigma(n) = 12*phi(n).at n=10A104902
• Alexandrian integers: numbers of the form n = p*q*r such that 1/n = 1/p - 1/q - 1/r for some integers p,q,r.at n=35A147811
• Triangle of z Transform coefficients from General Pascal [1,8,1} A142458 polynomials multiplied by factor 3^Floor[(2*k - 1)/3].at n=28A167786
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood.at n=41A272707
• Triangle read by rows: Riordan array (1/(1-9x)^(2/3), x/(9x-1)).at n=23A283151
• Triangle T(n,k) read by rows: number of labeled 2-regular digraphs (multiple arcs and loops allowed) on n nodes with k components.at n=51A307804
• E.g.f. S(x,y) = Integral C(x,y)*C(y,x) dx such that C(x,y)^2 - S(x,y)^2 = 1 and C(y,x) = 1 + Integral S(y,x)*C(x,y) dy, where S(x,y) = Sum_{n>=0} Sum_{k=0..n} T(n,k) * x^(2*n+1-2*k)*y^(2*k)/(2*n+1)!, as a triangle of coefficients T(n,k) read by rows.at n=12A322730
• First term of n-th difference sequence of (floor(k/e)), k >= 0.at n=18A325748
• First term of n-th difference sequence of (floor(r*k)), r = (1+sqrt(3))/2, k >= 0.at n=18A325750
• Numbers k such that R(k)/k is of the form m/(m + 1), where R(k) is the digital reversal of k.at n=13A376260