48768

Appears in sequences

• Sets with a congruence property.at n=18A002703
• Number of permutations with no hits on 2 main diagonals.at n=9A003471
• Numbers k such that k | sigma_9(k) - phi(k)^9.at n=37A055703
• Numbers n such that sigma(n) = 4*(n-phi(n)).at n=10A068420
• Numbers of the form 3*2^p*(2^p-1) where 2^p-1 is a (Mersenne) prime greater than 3.at n=2A110075
• Number of ways to choose n positive integers less than or equal to 2n such that none of the n integers divides another.at n=37A174094
• Number of ways to choose n positive integers less than or equal to 2n such that none of the n integers divides another.at n=38A174094
• The number of sets of n positive integers strictly less than 2*n such that no integer in the set divides another.at n=38A192298
• a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^3, where Lucas(n) = A000204(n).at n=8A203854
• Integers that are Rhonda numbers to base 18.at n=13A255735
• a(n) = A324488(n)/n.at n=8A324489
• Number T(n,k) of permutations of [n] having k points that are fixed or reflected; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=45A335872
• Numbers k for which A306927(k) [= A001615(k)-k] is a multiple of A344705(k) [= A001615(k)-A001065(k)], and their quotient is nonnegative.at n=44A344700
• Numbers whose even divisors have an integer harmonic mean.at n=35A348412
• Integers k such that there exists an integer 0<m<k such that (1/sigma(m)^2 + 1/sigma(k)^2)*(m+k)^2 = 1.at n=13A383964