12884901888
domain: N
Appears in sequences
- a(n) = 3*4^(n-1), n>0; a(0)=1.at n=17A002001
- Expansion of g.f. (1+x)/(1-2*x).at n=33A003945
- a(n) = 3*2^n.at n=32A007283
- Reciprocal of n terminates with an infinite repetition of digit 3. Multiples of 10 are omitted.at n=22A064562
- Smallest integer that can be expressed as the sum of consecutive odd numbers in exactly n ways.at n=30A068314
- a(n) = n! reduced mod 2^n.at n=33A068496
- Numbers m such that the largest prime power in the factorization of m equals phi(m).at n=30A081808
- a(n+2) = 4*a(n), with a(0)=1, a(1)=3.at n=33A084221
- a(1) = 3, a(n+1) = a(n)*phi(a(n)), where phi(n) is Euler's totient function.at n=6A085866
- Expansion of (1 - 4*x + 4*x^2 - 4*x^3)/(1 - 4*x).at n=18A092898
- Denominator of (3*2^(n-1) - 1)*integral_{x=0 to 1/(4^n)}1-sqrt x dx.at n=10A094085
- Numerator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.at n=19A095159
- 10^a(n) + 1 = A088773(n).at n=35A098011
- Numerators in the fractional coefficients that form the partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=19A110255
- Numerators in the coefficients that form the even-indexed partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=9A110259
- a(1) = 4, a(2) = 12, for n>1: a(n) = 3*4^(n-1).at n=16A110594
- Number of palindromes of length n (in base 4).at n=32A117856
- Numbers such that 2*UnitaryPhi(2*UnitaryPhi(n)) = n.at n=30A120453
- 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=35A122391
- Row sums of triangle A132476.at n=32A132477