158403

Appears in sequences

• a(n) = (n^2 - 1)*(n^2 - 3).at n=20A033596
• Composite squarefree numbers n such that p(i)+3 divides n-3, where p(i) are the prime factors of n.at n=13A225713
• Numbers k such that A011776(k) = A011776(k+1).at n=22A373725