47124

Appears in sequences

• Number of trees by stability index.at n=20A003428
• a(n) = floor(n*(n-1)*(n-2)*(n-3)/30).at n=36A011940
• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-2)/3.at n=39A048026
• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-3)/3.at n=39A048037
• Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=26A080395
• Numbers k such that the three second-degree cyclotomic polynomials x^2 + 1, x^2 - x + 1 and x^2 + x + 1 are simultaneously prime when evaluated at x=k.at n=27A087277
• A Graham-Pollak-like sequence with multiplier 3 instead of 2.at n=19A100671
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives x numbers.at n=9A125490
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+833)^2 = y^2.at n=39A129010
• Period of the decimal expansion of 1/F as F runs through the Fibonacci numbers greater than 1 and not divisible by 2 or 5.at n=21A175550
• Period of the decimal representation of 1/Fibonacci(n).at n=41A175561
• Numbers with prime factorization pqrs^2t^2.at n=24A189989
• Number of (w,x,y,z) with all terms in {1,...,n} and median<mean.at n=18A212135
• First occurrence of n in A225399, or -1 if n does not appear in A225399.at n=38A225400
• A fourth-order linear divisibility sequence related to the Pell numbers.at n=3A238537
• a(n) = number of knight's move paths of minimal length n steps, from origin at center of an infinite open chessboard to square (0,0) for n=0; to square (2,-1) for n=1; and to square ([(3n-3)/2], [(3n-4)/2]) for n>=2.at n=12A242512
• a(n) is the maximal number of shortest knight's move paths, from origin at center of an infinite open chessboard, to square with coordinates <= n.at n=16A242514
• a(n) is the maximal number of shortest knight's move paths, from origin at center of an infinite open chessboard, to square with coordinates <= n.at n=17A242514
• Numbers that belong to at least one amicable tuple.at n=39A255215
• Expansion of 1/2 * (((1 + 2*x)/(1 - 2*x))^(3/2) - 1).at n=13A305612