40128

Appears in sequences

• Numerator sequence of mean length of certain stackings of n+1 squares on a double staircase.at n=15A055245
• In the interior of a regular 2n-gon with all diagonals drawn, the number of points where exactly three diagonals intersect.at n=36A101363
• factorial(n) - A049614(n).at n=8A117736
• Triangle T(n, k) = n*( (n-1)! - (k-1)! ), read by rows.at n=32A137259
• Numbers with prime factorization pqrs^6.at n=21A190292
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w^2>x^2+y^2.at n=27A211631
• Numbers k such that in a rotated-square spiral with positive integers (A215468) among k's eight nearest neighbors five or more are primes.at n=17A215471
• Numbers n such that Sum_{i = 1..q} 1/d(i) is an integer where d(i) are the divisors of n for some q and n is primitive (the set {d(1), d(2), ..., d(q)} appears only once).at n=18A226853
• Averages q of twin prime pairs, such that q concatenated to q is also the average of a twin prime pair.at n=36A235109
• Number of (n+1) X (1+1) 0..2 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.at n=9A239171
• The q-series expansion of an expression related to fermionic systems.at n=16A257949
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 241", based on the 5-celled von Neumann neighborhood.at n=21A280143
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 470", based on the 5-celled von Neumann neighborhood.at n=30A288496
• Partial sums of A299898.at n=42A299899
• a(n) = A000041(n) * A000009(n).at n=20A304991