90240

Appears in sequences

• Numbers with prime factorization pqrs^7.at n=26A190473
• The greedy sequence of real numbers at least 1 that do not contain any 3-term geometric progressions with integer ratio.at n=41A235054
• Numbers k such that k = Product (p_j^e_j) = Product (p_j*(e_j + 1)).at n=30A304410
• a(n) = phi(n^5 - 1)/5 where phi is A000010.at n=12A319214
• Triangle read by rows: T(n,k) = number of permutations p of [n] such that max(|p(p(i)) - i|)=k (n>=1, 0<=k<=n-1).at n=42A364817