318780

Appears in sequences

• Product of all primes contained as binary substrings in binary representation of n.at n=46A078828
• a(n) = A081470(n)/n.at n=19A081471
• a(n) is smallest number with divisors which are congruent to 1, 2, ..., n-1 mod n.at n=43A140539
• Numbers with prime factorization pqrst^2u^2.at n=6A190380
• Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=24A196200
• Product_{k=1..n} floor(2*n/k - 1).at n=12A207646
• The positions of records in A236747.at n=20A237267
• Triangle read by rows: the reversed x = 1+q Narayana triangle at m=2.at n=50A243662
• a(n) = 6*binomial(n+1,5).at n=20A253945
• Expansion of 1/(1 - 2*x + 13*x^2).at n=11A272199
• a(n) is the least positive number whose divisors have all possible residues mod n.at n=43A280171
• Number of elements of order n in simple Mathieu group M_23.at n=3A284872
• a(n) = denominator of Sum_{1 <= i < j <= d(n)} 1/(d_j - d_i), sum over ordered pairs of divisors of n, where d(n) is the number of divisors of n.at n=45A330078
• Triangle read by rows: T(n,k) = binomial(n+1,k+1) * binomial(4*n-3*k+1,k) / (n+1), 0<=k<=n.at n=49A391047