43904

Appears in sequences

• Denominator of sum of -4th powers of divisors of n.at n=27A017672
• a(n) = 2*n^3.at n=28A033431
• Numbers whose prime factors are 2 and 7.at n=32A033847
• Triangle read by rows: T(n,k)=k^3*2^k*binomial(2n-k,n-k)/(2n-k) (1<=k<=n).at n=34A112327
• Numbers with no 1's in base 3, 4 & 10 expansions.at n=27A117564
• a(n) = n^3*2^n.at n=7A128789
• Numbers of the form p^7*q^3 where p and q are distinct primes.at n=3A179705
• a(n) = floor(1/{(2+n^4)^(1/4)}), where {} = fractional part.at n=28A184537
• Numbers k such that the sum of prime factors of k (counted with multiplicity) equals five times the largest prime divisor of k.at n=20A212863
• a(n) = sum_(d|n) ((product_(d|n) d) / d).at n=27A220846
• Number of 0..n arrays of length 5 with each element unequal to at least one neighbor, starting with 0.at n=13A221464
• Denominator of Product_{k=1..n-1} k^(2k-n-1).at n=25A280736
• Numbers that are the product of exactly 10 primes and are of the form prime(n) + prime(n + 1).at n=19A281927
• Coefficients in q-expansion of (3*E_2*E_4 - 2*E_6 - E_2^3)/1728, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=28A282097
• a(n) = Product_{d|n} (tau(d)*pod(d)) where tau(k) = the number of divisors of k (A000005) and pod(k) = the product of the divisors of k (A007955).at n=13A307101
• E.g.f.: A(x,y) = (cosh(x)*cosh(y) + sinh(x) + sinh(y)) / (1 - sinh(x)*sinh(y)), where A(x,y) = Sum_{n>=0} Sum_{k>=0} T(n,k) * x^n*y^k/(n+k)!, as a square table of coefficients T(n,k) read by antidiagonals.at n=39A322620
• E.g.f.: A(x,y) = (cosh(x)*cosh(y) + sinh(x) + sinh(y)) / (1 - sinh(x)*sinh(y)), where A(x,y) = Sum_{n>=0} Sum_{k>=0} T(n,k) * x^n*y^k/(n+k)!, as a square table of coefficients T(n,k) read by antidiagonals.at n=41A322620
• E.g.f.: C(x,y) = cosh(x)*cosh(y) / (1 - sinh(x)*sinh(y)), where C(x,y) = Sum_{n>=0} Sum_{k=0..2*n} T(n,k) * x^(2*n-k)*y^k/(2*n)!, as a triangle of coefficients T(n,k) read by rows.at n=19A322621
• E.g.f.: C(x,y) = cosh(x)*cosh(y) / (1 - sinh(x)*sinh(y)), where C(x,y) = Sum_{n>=0} Sum_{k=0..2*n} T(n,k) * x^(2*n-k)*y^k/(2*n)!, as a triangle of coefficients T(n,k) read by rows.at n=21A322621
• Cubefull numbers (A036966) with a record gap to the next cubefull number.at n=20A363014