9961472

Appears in sequences

• Theta series of D*_19 lattice.at n=27A022072
• a(n) = n*2^n.at n=19A036289
• 20-almost primes (generalization of semiprimes).at n=20A069281
• Main diagonal of the table of k-almost primes (A078840): a(n) = (n+1)-st integer that is an n-almost prime.at n=20A078841
• Inverse binomial transform of n*Pell(n).at n=38A093968
• Expansion of (1 - 4*x + 6*x^2)/(1 - 2*x)^2.at n=20A097064
• a(n) = prime(n)*2^prime(n).at n=7A100042
• a(n) = 19*2^n.at n=19A110288
• Number of functions f:[n]->[n] such that f[(2*x) mod n]=[2*f(x)] mod n for all x in [n], for n=1,2,3,... Here [n] denotes {0,1,2,...,n-1}.at n=37A117987
• Denominator of (ordinary) expansion of log((x/2-1)/(x-1)).at n=19A131135
• Row sums of triangle A134400.at n=19A134401
• a(1) = 1; for n > 1, a(n) = 2*a(n-1) if n is even, a(n) = ((n+1)/(n-1))*a(n-1) if n is odd.at n=37A171647
• Denominators of expansion of (Sum_{k=1..n} 1/k) - log(n(1+1/(2n))) - gamma.at n=17A189049
• a(n) is 2^phi(n) times the least common multiple of the proper divisors of n.at n=38A189914
• a(n) = (2n + 1)*2^(2n + 1); numbers k such that v(k)*2^v(k) = k, where v(n) = A007814(n) is 2-adic valuation of n.at n=9A288443
• Consider the Watanabe tag system defined in A291067; a(n) = number of binary words of length n which terminate in a cycle.at n=23A291781
• Numbers with prime factorization of the form p_1^p_2*p_2^p_3*...p_(n-1)^p_n*p_n where p_(n-1) < p(n) and n > 1.at n=12A294110