27435

Appears in sequences

• Octagonal pyramidal numbers: a(n) = n*(n+1)*(2*n-1)/2.at n=29A002414
• Number of intersection points of diagonals of an n-gon in general position, plus number of vertices.at n=30A014626
• Let f(n) = exp(Pi*sqrt(n)); sequence gives numbers n such that f(n) - floor(f(n)) < 1/10^3.at n=29A127028
• a(n) = 76*n^2 - 1.at n=18A158765
• Number of reduced words of length n in Coxeter group on 31 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.at n=3A162835
• Triangle of coefficients of polynomials v(n,x) jointly generated with A210741; see the Formula section.at n=51A210742
• Odd octagonal pyramidal numbers.at n=15A218326
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 502", based on the 5-celled von Neumann neighborhood.at n=38A272579
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 597", based on the 5-celled von Neumann neighborhood.at n=29A273146
• Numbers k such that (4*10^k + 143) / 3 is prime.at n=23A276846
• Expansion of Sum_{k>=1} x^k*(1 + x^k)/(1 - x^k)^4.at n=42A320941
• Doubly octagonal pyramidal numbers.at n=3A329757
• Centered 29-gonal numbers.at n=43A389798