Numbers k such that sigma(k) + phi(k) is a repdigit.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =11a(6) =21a(7) =49a(8) =186a(9) =207a(10) =221a(11) =342a(12) =406a(13) =3324a(14) =4443a(15) =33324a(16) =43375a(17) =222221a(18) =314000a(19) =344032a(20) =389924a(21) =414806a(22) =987652a(23) =2222221a(24) =190476186a(25) =222087442a(26) =222222221a(27) =422720878a(28) =2222222221a(29) =4444444443