6442450944

Appears in sequences

• a(n) = 6*4^n.at n=15A002023
• Expansion of g.f. (1+x)/(1-2*x).at n=32A003945
• a(n) = 3*2^n.at n=31A007283
• Row sums of the Lucas triangle A029635.at n=32A042950
• Numbers k such that d(k)^4 divides k.at n=11A046756
• a(n) is the position of A050614(n) in A062877.at n=32A062878
• Reciprocal of n terminates with an infinite repetition of digit 6. Multiples of 10 are omitted.at n=22A064565
• a(n) = n! reduced mod 2^n.at n=32A068496
• Let M_n be the n X n matrix M_(i,j)=1/(i+j+ij); a(n) is the numerator of det(M_n).at n=14A069740
• Numbers m such that the largest prime power in the factorization of m equals phi(m).at n=29A081808
• a(n) = gcd(n! mod 2^n, (n+1)! mod 2^(n+1)).at n=33A082887
• a(n) = (7*8^n + (-8)^n)/8.at n=11A083225
• a(n) = (3*8^n + 0^n)/4.at n=11A083233
• Number of ground-state 3-ball juggling sequences of period n.at n=18A084509
• 10^a(n) + 1 = A088773(n).at n=34A098011
• Numbers k such that phi(sigma(k)) - sigma(phi(k)) = 1.at n=9A116083
• Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.at n=17A121138
• Dimension of 2-variable non-commutative harmonics (Hausdorff derivative). The dimension of the space of non-commutative polynomials in 2 variables which are killed by all symmetric differential operators (where for a monomial w, d_{xi} ( w ) = sum over all subwords of w deleting xi once).at n=34A122391
• a(n) = (n+1)*2^(n*(n+1)).at n=5A128406
• Least n-almost prime of the form semiprime + 1.at n=31A128665