4257792

Appears in sequences

• Theta series of lattice D_3 tensor D_4 (dimension 12, det. 16384, min. norm 4).at n=17A033696
• Number of k's such that A002034(k) = n.at n=34A038024
• Number of integers less than A000108(n) relatively prime to A000108(n).at n=15A062624
• Number of cyclic arrangements (up to direction) of numbers 1,2,...,n such that any two neighbors are coprime.at n=15A242529
• Number of cyclic arrangements of S={1,2,...,2n} such that the difference of any two neighbors is coprime to their sum.at n=7A242533
• G.f. satisfies: A(x) = Sum_{n>=0} x^n * (1 + x*A(x)^(n-1))^n.at n=14A300041
• a(n) = n/(Sum_{k=1..n} 1/phi(A341813(n)*k)).at n=31A341814