279936000domain: NAppears in sequencesShifts left when MASKCONVolved with itself.at n=20A062177a(1)=1, a(n) = p*a(n-1), where p is the smallest prime satisfying gcd(n,p)=1.at n=20A160505Numbers of least prime signature (A025487) whose prime factorization has equal sum of even and odd exponents.at n=26A371600