Numbers k that divide sigma(k)-phi(k).

Terms

a(0) =1a(1) =2a(2) =12a(3) =42a(4) =1242a(5) =75960a(6) =1447488a(7) =3506976a(8) =6137440a(9) =10834488a(10) =17156160a(11) =90288000a(12) =431440416a(13) =454460160a(14) =704592000a(15) =1385119360a(16) =1588268480a(17) =10674673152a(18) =24913095480a(19) =31103703540a(20) =56015374080a(21) =80767843200a(22) =129631788000a(23) =463308768000a(24) =469897798656a(25) =834460413696