Greatest k such that s(k) = n, where s = A026272.

Terms

a(0) =3a(1) =5a(2) =8a(3) =11a(4) =13a(5) =16a(6) =18a(7) =21a(8) =24a(9) =26a(10) =29a(11) =32a(12) =34a(13) =37a(14) =39a(15) =42a(16) =45a(17) =47a(18) =50a(19) =52a(20) =55a(21) =58a(22) =60a(23) =63a(24) =66a(25) =68a(26) =71a(27) =73a(28) =76a(29) =79