41990400

Appears in sequences

• a(n) = 25*6^(n-2), with a(0)=1 and a(1)=4.at n=10A055846
• Even refactorable numbers k such that the number r of odd divisors is odd, the number s of even divisors is even, both r and s are divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.at n=27A120359
• Triangle read by rows: number of spanning trees obtained for an almost-complete bipartite graph by removing k disjoint edges from the complete bipartite graph K n,n with k<=n.at n=15A260383
• Numbers k with record values of the ratio d(k)/id(k) between the number of divisors and the number of infinitary divisors.at n=12A335832