Numbers k such that prime(k) == 1 (mod sigma(k)).

Terms

a(0) =1a(1) =3a(2) =6a(3) =7a(4) =58a(5) =79a(6) =191a(7) =339a(8) =443a(9) =516a(10) =1185a(11) =6275a(12) =20456a(13) =21471a(14) =27341a(15) =40123a(16) =40143a(17) =49678a(18) =50684a(19) =108977a(20) =136023a(21) =251789a(22) =432185a(23) =705256a(24) =2582498a(25) =2879786a(26) =3142462a(27) =3556591