35195domain: NAppears in sequencesa(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is largest prime dividing n.at n=40A137809Position of 7^n among 7-smooth numbers (A002473).at n=18A232093Numbers k such that A000712(k) is divisible by k.at n=9A304045