23408

Appears in sequences

• Coefficients of Legendre polynomials.at n=3A006750
• Triangle of coefficients of expansions of powers of x in terms of Legendre polynomials P_n(x) over common denominator.at n=38A008317
• a(n) = n*(n+1)*(4*n+5)/6.at n=32A016061
• Numbers k such that k+1 and 3*k+1 are perfect squares.at n=4A045899
• For n > 5, a(n) = 15*a(n-1) - 15*a(n-2) + a(n-3); initial terms are 1, 3, 8, 120, 1680.at n=5A051047
• Engel expansion of sinh(1/2).at n=38A068379
• Numbers which are sums of two, three and four cubes.at n=29A085337
• Numbers which are sums of two, three, four and also sums of five cubes.at n=28A085338
• Numbers which are the sum of two positive cubes and divisible by 11.at n=32A101852
• a(n) = 3*a(n-1) + 3*a(n-2) - a(n-3); a(0) = 1, a(1) = 0, a(2) = 3. a(n) = 4*{a(n-1)+(-1)^n}-a(n-2); a(0) = 1, a(1) = 0.at n=9A120892
• Largest k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k, or 0 if no such k exists.at n=6A130181
• a(n) = 4*(3*n+1)*(3*n+2).at n=25A144410
• a(n) = 4*a(n-1) - 2*a(n-2) for n > 1; a(0) = 3, a(1) = 14.at n=7A164304
• a(n) = (n-1)*(n+2)*(n^2 + n + 2)/4.at n=16A168566
• An antidiagonal triangle based on: t(n,q) = If[n == 0, 1, Sum[Eulerian[n, k]*q^n, {k, 1, n, 2}]].at n=29A174005
• Number of strings of numbers x(i=1..n) in 0..6 with sum i^3*x(i) equal to n^3*6.at n=9A184254
• a(n):=(Sum_{k=0}^n C(6k,3k)C(3k,k)C(6(n-k),3(n-k))C(3(n-k),n-k))/((2n-1)Binomial[3n,n]).at n=3A189286
• Denominators a(n) of Pythagorean approximations b(n)/a(n) to sqrt(3).at n=7A195499
• Number of (w,x,y) with all terms in {0,...,n} and w<=x+y and x<=y.at n=37A212983
• Sum of prime divisors of n (with repetition) is one less than the sum of prime divisors (with repetition) of n+1.at n=25A228126