544195584

Appears in sequences

• a(n) = 6*a(n-2), starting with 1, 3, 9.at n=22A026565
• a(n)=Product{k=0..n, 1+2^A010060(k)}/2.at n=22A101652
• Maximal values of permanent on (0,1) square matrices of order n with row and column sums 3.at n=31A232553
• Squares whose arithmetic derivative is a square.at n=9A266890
• a(n) = Product_{d|n} psi(d), where psi(m) is the sum of totatives of m (A023896).at n=35A280246
• Numbers whose number of divisors is coprime to 210.at n=16A358001
• Numbers k in A020487 with arithmetic derivative k' (A003415) in A020487.at n=27A377383
• Powers k^m, m > 1, where k is an Achilles number that has a primorial kernel but is not a product of primorials.at n=16A389374