27869184

Appears in sequences

• a(1)=1; for n>1, a(n) = a(n-1) + lcm(a(n-1),n).at n=13A135504
• Number of divisors of A138113(n).at n=33A140410
• E.g.f. satisfies: A(x,y) = exp(x*y*exp(x*A(x,y))).at n=49A161552
• Numbers which can be written using their digits in order and only multiplication and squaring operators.at n=24A194766
• Numbers that can be written using its own digits in order and using multiplication and cubing operators.at n=7A195671
• For n > 2 , a(n) = a(n-2) + lcm(a(n-2), n-1) with a(1)=2, a(2)=2.at n=17A217662
• Numbers k such that A007954(k) divides k and k divides A007954(k)^2.at n=28A257554
• Zuckerman numbers which divided by the product of their digits give integers which are also divisible by the product of their digits, and so on, until result is 1.at n=25A343744
• Number T(n,k) of partitions of [3n] into n sets of size 3 having exactly k sets {3j-2,3j-1,3j} (1<=j<=n); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=30A370347