18087

Appears in sequences

• Numbers k such that 6*prime(k) -+ {1,5} are all prime.at n=26A174393
• Number of different figures obtained by a putting two Young diagrams of partitions lambda and mu, such that |lambda| + |mu| = n on top of each other.at n=28A225751
• Number of magic labelings with magic sum n of 2nd graph shown in link.at n=11A244870
• Number of ways to select a nonempty subset s from an n-set and then partition s into blocks of equal size.at n=10A262280
• a(n) = Sum_{k=1..n} (-1)^(k+1) * floor(n/k)^3.at n=26A344721
• a(n) is the smallest number which can be represented as the sum of n distinct nonzero n-gonal numbers in exactly n ways, or 0 if no such number exists.at n=14A350405