393216

Appears in sequences

• Number of invertible 2 X 2 matrices mod n.at n=31A000252
• Numbers that are not the sum of 4 nonzero squares.at n=34A000534
• a(n) = 6*4^n.at n=8A002023
• Expansion of g.f. (1+x)/(1-2*x).at n=18A003945
• Numbers that have a unique partition into a sum of four nonnegative squares.at n=33A006431
• a(n) = 3*2^n.at n=17A007283
• Numbers of the form 2^n or 3*2^n.at n=36A029744
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*8^j.at n=26A038214
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*3^j.at n=37A038233
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*2^j.at n=22A038280
• Row sums of the Lucas triangle A029635.at n=18A042950
• a(n) = T(n,3), array T as in A049600.at n=13A049612
• Smallest number x such that cototient(x) = 2^n.at n=18A058764
• A hierarchical sequence (W'2{3}c - see A059126).at n=31A059154
• a(n) = (n+1)*2^(n+4).at n=12A059165
• For n >= 2, let N_n denote the set of all unipotent upper-triangular real n X n matrices A such that for every k=1,2,...,n-1 the minor of A with rows 1,2,...,k and columns n-k+1,...,n is nonzero. a(n) is the number of connected components of N_n.at n=16A060344
• Spherical growth series for modular group.at n=35A063759
• Reciprocal of n terminates with an infinite repetition of digit 6. Multiples of 10 are omitted.at n=12A064565
• Numbers having just one anti-divisor.at n=4A066466
• Products of exactly 18 primes (generalization of semiprimes).at n=1A069279