19456

Appears in sequences

• Coordination sequence for sigma-CrFe, Position Xa.at n=35A009962
• a(n) = Sum_{k=0..n} T(n,k) * T(n,2n-k), with T given by A027082.at n=8A027104
• 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 69.at n=36A031567
• First differences of A045891.at n=14A034007
• Numerator of Sum_{k=0..n} 1/binomial(n,k).at n=15A046825
• Number of basis partitions of n+25 with Durfee square size 5.at n=36A053800
• Numbers k of the form k=p*2^x, with p prime and x>=0, such that tau(k)-m = A058933(k) where tau(k) is the number of divisors of k and m is 0 or 1.at n=7A058953
• 11-almost primes (generalization of semiprimes).at n=20A069272
• Denominators in the Maclaurin series for arctan(1+x).at n=18A075554
• a(n) = 2*a(n-1) + 4*a(n-2), a(0)=1, a(1)=1.at n=9A084057
• Second differences of A045623, prefixed by an initial 1.at n=13A109975
• a(n) = 19*2^n.at n=10A110288
• Numbers n such that p(7n) is prime, where p(n) is the number of partitions of n.at n=29A114167
• a(n) = (2*n + 1) * 2^(n + 1).at n=9A118417
• a(n) = n-th integer from among those positive integers with an exponent of n in their prime-factorizations.at n=9A123904
• a(n) = denominator of Product_{k=1..n} k^mu(n+1-k), where mu(k) = A008683(k).at n=19A130089
• a(n) = n*2^floor((n+1)/2).at n=19A132314
• Numbers with 22 divisors.at n=6A137485
• Eigentriangle by rows, n terms of (5 * A084057) followed by A084057(n).at n=44A143969
• Duplicate of A084057.at n=8A163302