Numbers k such that 1 + Sum_{i=1..k} floor(k/i)*(2^i) is a prime number.

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =18a(5) =25a(6) =26a(7) =30a(8) =40a(9) =50a(10) =95a(11) =150a(12) =348a(13) =694a(14) =1052a(15) =1222a(16) =1808a(17) =2567a(18) =4917a(19) =5399a(20) =7438a(21) =10720a(22) =12152a(23) =30412a(24) =38313a(25) =53620a(26) =121419a(27) =123523