Numbers k such that sigma(k+2) = 2*sigma(k-2).

Terms

a(0) =5a(1) =13a(2) =313a(3) =1153a(4) =26206a(5) =100318a(6) =111928a(7) =160873a(8) =363283a(9) =644278a(10) =1676428a(11) =2097808a(12) =2639518a(13) =3875998a(14) =5349238a(15) =5738773a(16) =5903638a(17) =6045583a(18) =11272903a(19) =13192933a(20) =17242333a(21) =18234403a(22) =19667998a(23) =29520643a(24) =29595193a(25) =31944238a(26) =36918448a(27) =37049803a(28) =37201813a(29) =43522288