27840

Appears in sequences

• a(n) = (7*n+1)*(7*n+2)*(7*n+4).at n=4A001547
• Values of phi(k) when phi(k) = phi(k+1).at n=31A003275
• a(n) = floor(n*(n-1)*(n-2)*(n-3)/31).at n=32A011941
• Expansion of e.g.f. (1-2*x)/(1-4*x+2*x^2).at n=5A052680
• a(n) = binomial(n,4) + binomial(n,2).at n=29A055795
• Array read by antidiagonals: T(k,d) = number of different hyperplanes in d-space with integer coefficients in set {-k,...,-1,0,1,...,k}.at n=24A061559
• Number of divisors of (n!)^n (A036740).at n=7A062960
• Numbers k such that Omega(k) = Omega(k+1) + Omega(k+2) + Omega(k+3) + Omega(k+4) where Omega(k) denotes the number of prime factors of k, counting multiplicity.at n=25A078094
• Numbers k such that 2^k - 1 is divisible by (k-1).at n=25A087965
• Numbers that can be expressed as the difference of the squares of primes in exactly five distinct ways.at n=29A092001
• Triangle T(n, k) = binomial(n, k) * A000085(n-k), 0 <= k <= n.at n=58A111062
• a(n) = Product_{k>=0} (1 + floor(n/2^k)).at n=28A132269
• Expansion of psi(q^2) / f(-q)^2 in powers of q where psi(), f() are Ramanujan theta functions.at n=19A137829
• Terms of A061047 ending in 0.at n=32A146950
• a(n) = 8*a(n-1) + 56*a(n-2), n > 2; a(0)=1, a(1)=1, a(2)=15.at n=5A155000
• Triangle of polynomial coefficients related to the series expansions of (1-x)^((-1-2*n)/2).at n=24A161198
• Numbers with prime factorization pqrs^6.at n=12A190292
• a(n) = n*(5n^2 + 3n + 4) / 6.at n=32A203551
• Integer areas A of the integer-sided triangles such that the product of the inradius and the circumradius is a square.at n=32A232329
• 2^(p-1) modulo p^3, where p = prime(n).at n=12A271234