20608

Appears in sequences

• Degrees of irreducible representations of Conway group Co3.at n=17A003910
• Degrees of irreducible representations of Conway group Co3.at n=18A003910
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 71.at n=39A031569
• XOR-convolution of squares A000290 with themselves.at n=32A033460
• Numerators of continued fraction convergents to sqrt(409).at n=7A041776
• Generalized Stirling number triangle of the first kind.at n=33A051187
• Numbers n such that n+cototient(n) is a power of 2.at n=24A053159
• Nonprimes n such that n+cototient(n) is a power of 2.at n=19A053162
• Triangle read by rows: T(n,k) = S1(n,k)*2^k, where S1(n,k) is an unsigned Stirling number of the first kind (cf. A008275) (n >= 1, 1 <= k <= n).at n=33A125553
• Coefficients of generalized factorial polynomials p(x, n) = (x/a - (n-1))*p(x, n-1) with p(x, 0) = 1, p(x, 1) = x/a and a = 1/2. Triangle read by rows, for n >= 0 and 0 <= k <= n.at n=42A137312
• Coefficients of raising factorial polynomials, T(n,k) = [x^k] p(x, n) where p(x, n) = (m*x + n - 1)*p(x, n - 1) with p[x, 0] = 1, p[x, -1] = 0, p[x, 1] = m*x and m = 2. Triangle read by rows, for n >= 0 and 0 <= k <= n.at n=42A137320
• G.f. satisfies: A(x) = 1 + 2*x*AGM(1, A(x)^4).at n=6A171455
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=27A179696
• Coefficient of x in the reduction (by x^2->x+1) of polynomial p(n,x) identified in Comments.at n=8A192351
• Triangular array: the fission of ((x+1)^n) by ((2x+1)^n).at n=47A193858
• E.g.f.: A(x) = Sum_{n>=0} (3^n + (-1)^n)^n * exp((3^n + (-1)^n)*x) * x^n/n!.at n=3A196458
• Number of (n+1) X 6 0..1 arrays with the number of clockwise edge increases in every 2 X 2 subblock differing from each horizontal or vertical neighbor.at n=13A205190
• [s(k)-s(j)]/9, where the pairs (k,j) are given by A205872 and A205873, and s(k) denotes the (k+1)-st Fibonacci number.at n=33A205875
• Sum_{0<j<k<=n} (k^4-j^4).at n=5A206811
• Triangle of coefficients of polynomials v(n,x) jointly generated with A210866; see the Formula section.at n=48A210867