40992

Appears in sequences

• Matrix square of Stirling2 triangle A008277: 2-levels set partitions of [n] into k first-level subsets.at n=31A039810
• Triangle of generalized Stirling numbers of 2nd kind.at n=32A046817
• Numbers with no 1's in their base-3, base-4, and base-5 expansions. Intersection of A005823, A023709, and A023725.at n=10A117482
• Numbers with no 1's in base 3, 4 & 10 expansions.at n=21A117564
• Numbers m such that A049060(m)*sigma(m) = k*uphi(m)*m for some integer k.at n=6A122483
• Call (m,n) a "(-1)SSU amicable pair" if (-1)Sigma(m)*Sigma(m) = k*UnitaryPhi(m)*(m+n) and (-1)Sigma(n)*Sigma(n) = k*UnitaryPhi(n)*(m+n) for some integer k. Sequence gives values of m, assuming n <= m.at n=7A123728
• Values of n associated with A123728.at n=7A123729
• Square of the Stirling2 matrix A048993.at n=40A130191
• Number of partitions of a 2n-set into colored blocks, such that exactly n colors are used and the colors are introduced in increasing order.at n=4A321712
• Number of edges among all distinct circles that can be constructed from n equally spaced points along a line using only a compass.at n=16A359254