Numbers n such that 2^n'-1 is prime, where n' is the arithmetic derivative of n.

Terms

a(0) =6a(1) =10a(2) =22a(3) =30a(4) =34a(5) =58a(6) =66a(7) =118a(8) =618a(9) =730a(10) =874a(11) =1353a(12) =2554a(13) =2937a(14) =7874a(15) =7954a(16) =8842a(17) =11922a(18) =12430a(19) =15442a(20) =17186a(21) =26034a(22) =115690a(23) =166774a(24) =170134a(25) =221002a(26) =264094a(27) =368599a(28) =1419045a(29) =1443118