Numbers x that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) and gpf(x) are the least and the greatest prime factors of x: A020639 and A006530.

A307117

Numbers x that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) and gpf(x) are the least and the greatest prime factors of x: A020639 and A006530.

Terms

    a(0) =8a(1) =27a(2) =105a(3) =125a(4) =231a(5) =343a(6) =627a(7) =897a(8) =935a(9) =1331a(10) =1581a(11) =1729a(12) =2197a(13) =2465a(14) =2967a(15) =3525a(16) =4123a(17) =4301a(18) =4715a(19) =4913a(20) =5487a(21) =6859a(22) =7035a(23) =7685a(24) =7881a(25) =9717a(26) =10707a(27) =11339a(28) =12167a(29) =14993

External references