88638

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= sqrt(n).at n=20A048094
• Squarefree numbers sandwiched between two brilliant numbers.at n=18A085706
• Let x(1)x(2)...x(q) the decimal expansion of the numbers k having exactly q distinct prime divisors p(1) < p(2) < ... < p(q). Sequence lists the numbers k such that p(1)/x(1) + p(2)/x(2) + ... + p(q)/x(q) is an integer.at n=23A235152
• a(0)=1; a(n) = Sum_{k=1..n-1} d(k)*a(n-k), where d(m) is m-th bit in binary expansion of n.at n=27A260956
• G.f. satisfies A(x) = 1 + x/(1 + x^3) * A(x/(1 + x^3)).at n=20A360898