-1767

Appears in sequences

• Generalized sum of divisors function.at n=34A002130
• a(n) = -(1/2)*(n+2)*(n^2 - 6*n - 1).at n=17A028494
• a(n) = Sum_{k=0..n} (-1)^(n-k)*k*Stirling2(n,k).at n=10A101851
• G.f. A(x) satisfies: Sum_{n>=0} log( A(2^n*x) )^n / n! = 1 + Sum_{n>=0} 2^(2^n-n) * x^(2^n).at n=5A167000
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of max{i(j+1-1),j(i+1)-1} (A203998).at n=37A203999
• Values of n such that L(5) and N(5) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=58A226925
• Values of n such that L(19) and N(19) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=11A227522
• Expansion of (1+4*x+x^2) / ((1-x)^3*(1+x)^4).at n=34A229834
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 489", based on the 5-celled von Neumann neighborhood.at n=31A272513
• Expansion of f(-x)^3 * f(-x^2) * chi(-x^3)^3 in powers of x where chi(), f() are Ramanujan theta functions.at n=49A280328
• G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 + 2*x)) / (1 + 2*x).at n=9A350456
• a(1) = 1; a(n) = Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=43A361981
• a(1) = 1; a(n) = Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=44A361981