Numbers k that divide 4^k + 4.

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =20a(5) =52a(6) =130a(7) =370a(8) =1066a(9) =1090a(10) =2626a(11) =4580a(12) =7540a(13) =9140a(14) =21268a(15) =21682a(16) =24634a(17) =26596a(18) =29380a(19) =38740a(20) =40330a(21) =65026a(22) =146810a(23) =152164a(24) =154180a(25) =159172a(26) =211492a(27) =271426a(28) =290116a(29) =330706