5898240

Appears in sequences

• Integer part of denominators of nonzero terms in asymptotic expansion of the Riemann-Seigel Z-function.at n=9A050277
• Expansion of e.g.f. x^2*exp(4*x).at n=10A052780
• 20-almost primes (generalization of semiprimes).at n=10A069281
• Number of subsets of {1,.., n} containing no twin prime pairs.at n=23A089827
• Row sums of triangle A094280.at n=20A094283
• a(n) is n! times the coefficient of Pi^floor(n/2) in the volume of an n-dimensional unit ball.at n=13A094941
• Expansion of e.g.f. (1+4*x)/(1-4*x).at n=6A098560
• a(n) is the least k with n prime factors (counting multiplicity) such that the sum of these n factors divides k. First member of A036844 with n prime factors.at n=19A104465
• Numbers m such that, in the prime factorization of m, the product of the prime factors equals the sum of prime factors and exponents.at n=29A231293
• a(0) = 1; a(n+1) is the smallest number not in the sequence such that a(n+1) - Sum_{i=1..n} a(i) divides a(n+1) + Sum_{i=1..n} a(i).at n=42A250305
• Number of (n+2) X (n+2) 0..1 arrays with no 3 X 3 subblock diagonal sum 0 and no antidiagonal sum 3 and no row sum 0 or 3 and no column sum 0 or 3.at n=32A258958
• a(n) = 2^n * floor(n/2)!at n=13A271216
• Partial products of A029940 (Product_{d|n} phi(d)).at n=10A280132
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 366", based on the 5-celled von Neumann neighborhood.at n=24A287855
• Irregular triangle T(n,k) read by rows of the coefficients of Pi^(2k) in the expansion of Sum_{k>=1} (1 / (4k^2-1)^n) with denominator 2^(2n)*(n-1)!.at n=15A382784
• Integers k such that A008472(k) / A001222(k) = 1/2.at n=20A390139