Position of n-th 5 in A031076.

Terms

a(0) =5a(1) =20a(2) =38a(3) =56a(4) =74a(5) =81a(6) =83a(7) =85a(8) =87a(9) =89a(10) =91a(11) =92a(12) =93a(13) =95a(14) =97a(15) =110a(16) =128a(17) =146a(18) =170a(19) =197a(20) =224a(21) =251a(22) =278a(23) =289a(24) =292a(25) =295a(26) =298a(27) =301a(28) =304a(29) =305