Numbers k such that sigma(k+1) = 3 * sigma(k).

Terms

a(0) =1a(1) =1919a(2) =2759a(3) =11219a(4) =27089a(5) =50039a(6) =58463a(7) =100127a(8) =113831a(9) =115289a(10) =120203a(11) =131879a(12) =148511a(13) =233729a(14) =244319a(15) =308039a(16) =461099a(17) =554063a(18) =596447a(19) =1406303a(20) =1486619a(21) =2285519a(22) =2880989a(23) =5138783a(24) =5369111a(25) =5521619a(26) =5736743a(27) =6621383a(28) =7496279a(29) =7683191