Position of n-th 5 in A031045.

Terms

a(0) =5a(1) =18a(2) =34a(3) =50a(4) =66a(5) =73a(6) =75a(7) =77a(8) =79a(9) =81a(10) =82a(11) =83a(12) =85a(13) =87a(14) =98a(15) =114a(16) =135a(17) =159a(18) =183a(19) =207a(20) =231a(21) =241a(22) =244a(23) =247a(24) =250a(25) =253a(26) =255a(27) =256a(28) =259a(29) =262