4294901760
domain: N
Appears in sequences
- Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.at n=33A011949
- Expansion of g.f.: 2*x*(1-x)/((1-2*x)*(1-2*x^2)).at n=32A014236
- a(n) = 4^n - 2^n.at n=16A020522
- a(n) = 4^n - n^4.at n=16A024040
- Number of aperiodic binary strings of length n; also number of binary sequences with primitive period n.at n=32A027375
- Solutions x of 2*uphi(x)=x, where uphi is the unitary phi function (A047994).at n=6A030163
- Row sums of triangle T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd(a(1), a(2), ..., a(m), n) = 1, in A020921.at n=31A038199
- Number of 4-ary sequences with primitive period n.at n=16A054719
- Number of primitive (aperiodic) palindromes using a maximum of four different symbols.at n=31A056460
- Largest solution of phi(x) = 2^n.at n=30A058215
- S(n; 0,1) = S(n; 2,3) where S(n; t,s) is the number of length n 4-ary strings whose digits sum to t mod 4 and whose sum of products of all pairs of digits sum to s mod 4.at n=17A068711
- Number of strings over Z_4 of length n with trace 0 and subtrace 2.at n=17A068774
- Number of strings over Z_4 of length n with trace 2 and subtrace 2.at n=17A068790
- Number of words of length 2n in the two letters s and t that reduce to the identity 1 by using the relations ssTT=1, ststSS=1 and ststTT=1, where S and T are the inverses of s and t, respectively (i.e., sS=1 and tT=1). The generators s and t and the three stated relations generate the quaternion group Q4.at n=16A071930
- Number of strings of length n over GF(4) with trace 1 and subtrace x where x = RootOf(z^2+z+1).at n=17A073999
- Smallest oblong number having n prime divisors (with multiplicity).at n=19A083001
- Algebraic order of r_n, the value of r in the logistic map that corresponding to the onset of the period 2^n-cycle.at n=5A087046
- Euler totient function phi values of multiperfect numbers.at n=18A098203
- Central terms of the rows of the XOR difference triangle of the powers of 2 (A099884) so that a(n) = A099884(n, floor(n/2)).at n=31A099885
- a(n) = f(f(n+1)) - f(f(n)), where f(m) = 2^m.at n=4A111403