137438953472
domain: N
Appears in sequences
- Successive numerators of Wallis's approximation to Pi/2 (reduced).at n=21A001901
- a(n) = 2^(2n+1).at n=18A004171
- Least number which is side of n Pythagorean triples.at n=35A006593
- a(n) = 2^(3*n+1).at n=12A013730
- a(n) = 2^(4*n+1).at n=9A013776
- a(n) = 2^(5*n + 2).at n=7A013823
- a(n) = 2^A031142(n).at n=10A031156
- a(n) = 2^(n-th prime).at n=11A034785
- Coordination sequence for diamond structure D^+_38. (Edges defined by l_1 norm = 1.)at n=19A035895
- Denominator of coefficients of both EllipticK/Pi and EllipticE/Pi.at n=10A038533
- Numbers of form 2^k (for values of k see A050723) containing no pair of consecutive equal digits (probably finite).at n=28A050732
- Smallest number whose Euler totient is divisible by 2^n.at n=36A053576
- If n is odd a(n) = 1, if n is even a(n) = 2^(n-1).at n=37A066532
- Powers of 2 with initial digit 1.at n=11A067488
- Powers of 2 with even digit sum.at n=15A067507
- a(n) = 2^(2^n + n).at n=5A073113
- Goedel encoding of the prime factors of n, in increasing order and repeated according to multiplicity.at n=36A074736
- Numerator of 2^n/n.at n=36A075101
- a(n) = the least positive integer k such that b(k) = n, where b(k) (A076526) is defined by b(k) = r * max{e_1,...,e_r} if k = p_1^e_1 *...* p_r^e_r is the canonical prime factorization of k.at n=36A076745
- Expansion of (1-2*x)/(1-4*x).at n=19A081294