209712

Appears in sequences

• Number of orbits of length n under the full 16-shift (whose periodic points are counted by A001025).at n=4A060219
• Numbers k such that usigma(phi(k)) is a prime.at n=36A065875
• Numbers k such that phi(k) is a perfect 8th power.at n=25A078168
• a(n) = 4 * floor(24*2^n/15) = 4*A077854(n).at n=15A102652
• Number of monic irreducible polynomials of degree 5 in GF(2^n)[x].at n=3A115491
• Triangle read by rows: T(n,k) is the number of paths of length n in the first quadrant, starting at the origin, ending at height k and consisting of 2 kind of upsteps U=(1,1) (U1 and U2), 3 kind of flatsteps F=(1,0) (F1, F2 and F3) and 1 kind of downsteps D=(1,-1).at n=37A134426
• Number of 5-bead necklaces of n colors not allowing reversal, with no adjacent beads having the same color.at n=16A208536
• Numbers h such that 2^phi(h) == phi(h) (mod h).at n=36A292544