Numbers k such that sigma(k) = 4*phi(k).

Terms

a(0) =14a(1) =105a(2) =248a(3) =418a(4) =1485a(5) =3135a(6) =3596a(7) =3956a(8) =4064a(9) =5396a(10) =8636a(11) =20026a(12) =23374a(13) =25714a(14) =35074a(15) =35343a(16) =39105a(17) =41656a(18) =55154a(19) =56134a(20) =56536a(21) =71145a(22) =74613a(23) =87087a(24) =124605a(25) =150195a(26) =175305a(27) =192855a(28) =263055a(29) =393104