Solutions of the equation n' = n + phi(n), where n' is the arithmetic derivative of n.

Terms

a(0) =8a(1) =12a(2) =100a(3) =140a(4) =243a(5) =405a(6) =1372a(7) =46875a(8) =56644a(9) =64827a(10) =98260a(11) =101871a(12) =107811a(13) =129375a(14) =230692a(15) =243675a(16) =300820a(17) =644204a(18) =851175a(19) =1953125a(20) =3828125a(21) =7948395a(22) =19307236a(23) =28218268a(24) =36517316a(25) =69330772a(26) =70174377a(27) =93961125a(28) =115008417a(29) =173353125