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

A307108

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

Terms

    a(0) =105a(1) =231a(2) =627a(3) =897a(4) =935a(5) =1581a(6) =1729a(7) =2465a(8) =2967a(9) =3525a(10) =4123a(11) =4301a(12) =4715a(13) =5487a(14) =7035a(15) =7685a(16) =7881a(17) =9717a(18) =10707a(19) =11339a(20) =14993a(21) =16377a(22) =17353a(23) =17655a(24) =20213a(25) =20915a(26) =23779a(27) =24765a(28) =25327a(29) =26331

External references