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

Terms

a(0) =3a(1) =30237a(2) =292317a(3) =3116957a(4) =4044037a(5) =6902277a(6) =73442597a(7) =115767957a(8) =137410557a(9) =416776357a(10) =526908197a(11) =541579497a(12) =695350653a(13) =758403357a(14) =1105731897a(15) =1178082357a(16) =1233277917a(17) =1309742557a(18) =1866261597a(19) =1998267037a(20) =2161411557a(21) =2563416237a(22) =2750761437a(23) =2873771997a(24) =2892203997a(25) =3331848517a(26) =3621735037a(27) =3758847117