21924

Appears in sequences

• a(n) = n*(n-1)*(n-2) (or n!/(n-3)!).at n=29A007531
• a(n) = floor( n*(n-1)*(n-2)*(n-3)/26 ).at n=29A011936
• a(n) = floor(n*(n-1)*(n-2)*(n-3)/30).at n=30A011940
• Define the generalized Pisot sequence T(a(0),a(1)) by: a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n). This is T(6,31).at n=5A022034
• a(n) = lcm(n,n+1,n+2).at n=26A033931
• Denominator of b(n)-b(n+1), where b(n) = n/((n+1)(n+2)) = A026741/A045896.at n=25A051713
• a(n) = (2n+1)*(2n+2)*(2n+3).at n=13A069072
• a(n) = (4*n-1)*4*n*(4*n+1).at n=7A069140
• Indices k such that A020503(k)=Phi[k](-4) is prime, where Phi is a cyclotomic polynomial.at n=46A138926
• Indices k such that A019322(k) = Phi[k](4) is prime, where Phi is a cyclotomic polynomial.at n=48A138934
• The 3rd Witt transform of A000027.at n=24A147611
• Number of nondecreasing integer sequences of length 6 with sum zero and sum of absolute values 2n.at n=32A158140
• Denominator of the sixth increasing diagonal of the autosequence of the second kind from (-1)^n/(n+1).at n=26A218289
• Triangle (read by rows) of coefficients of the polynomials (in ascending order) of the denominators of the generalized sequence of fractions f(n) defined recursively by f(1) = m/1; f(n+1) is chosen so that the sum and the product of the first n terms of the sequence are equal.at n=43A225200
• a(n) = 3*n*(3*n + 1)*(3*n + 2).at n=8A228889
• Number of espalier polycubes of a given volume in dimension 3.at n=31A229915
• Cardinality of the Weyl alternation set corresponding to the zero-weight in the representation of the Lie algebra sp(2n) whose highest weight is the second fundamental weight.at n=13A243094
• Numbers n such that there exists an x!=n that makes {n,n,x} an amicable multiset.at n=5A259302
• Numbers that belong to at least one amicable multiset.at n=39A259307
• Abundant numbers n such that sigma(sigma(n) - 2*n) = sigma(n).at n=7A292365