Numbers k such that sigma(k) - k - 1 is a perfect number.

Terms

a(0) =8a(1) =115a(2) =187a(3) =1375a(4) =2455a(5) =8143a(6) =13543a(7) =18261a(8) =21103a(9) =23479a(10) =40615a(11) =41623a(12) =43279a(13) =49183a(14) =49441a(15) =51703a(16) =56743a(17) =61063a(18) =61279a(19) =61423a(20) =89287a(21) =95551a(22) =137887a(23) =214303a(24) =331567a(25) =379807a(26) =476071a(27) =715471a(28) =1422871a(29) =1515967