40602
domain: N
Appears in sequences
- Triangle read by rows: T(n,k) = Sum_{c in C(n,k)} lcm(c) where C(n,k) is the set of all k-subsets of {1,2,...,n}.at n=52A181853
- Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|+|x-y+|y-z|=n.at n=35A212904
- Oblong numbers (A002378) whose sum of divisors is also an oblong number.at n=10A226363
- Oblong numbers n such that n - 1 and n + 1 are both semiprime.at n=37A276565
- Oblong numbers which are products of four distinct primes.at n=35A358988
- Triangle read by rows: T(n, k) = n! * 4^k * hypergeom([-k], [-n], -1/4).at n=24A375612