18286

Appears in sequences

• Truncated triangular pyramid numbers: a(n) = (n-7)*(n^2 + 10*n - 108)/6, n >= 8.at n=40A051941
• a(n) is the smallest index m such that Sum_{k=2..m} 1/PrimePi(k) >= n, where PrimePi()=A000720().at n=42A074633
• Number of conjugacy classes of solvable subgroups of the symmetric group.at n=13A218911
• Smallest m such that A258062(m) = n.at n=27A258063
• a(n) = Sum_{k=0..n} k*A000009(k).at n=25A270105
• Number of length-n quasiperiodic binary strings.at n=25A320434
• Number of partitions of n with at most five part sizes.at n=37A364809
• a(n) is the number of compositions of n where the first part is the largest part and the last part is not 1. Row sums of A368579.at n=19A368279