Numbers k such that sigma(k) = 2*k + 3*phi(k).

Terms

a(0) =60a(1) =168a(2) =1530a(3) =3672a(4) =21648a(5) =37536a(6) =40608a(7) =48024a(8) =83904a(9) =87648a(10) =352704a(11) =354384a(12) =560664a(13) =7285968a(14) =7816608a(15) =11877408a(16) =19186848a(17) =90799104a(18) =235465056a(19) =551812608a(20) =766099296a(21) =5813035008