Numbers n such that sigma(n) = phi(3n).

Terms

a(0) =15a(1) =35a(2) =357a(3) =1045a(4) =3339a(5) =5049a(6) =10659a(7) =12441a(8) =24871a(9) =24969a(10) =29029a(11) =50065a(12) =58435a(13) =64285a(14) =87685a(15) =99693a(16) =132957a(17) =137885a(18) =140335a(19) =353133a(20) =423657a(21) =596037a(22) =655707a(23) =734517a(24) =745503a(25) =894387a(26) =1390753a(27) =1406427a(28) =1529983a(29) =1641783