Numbers k such that k*2^m+1 is prime for exactly one exponent m in the range 0<=m<=k.

Terms

a(0) =31a(1) =91a(2) =353a(3) =493a(4) =512a(5) =587a(6) =692a(7) =752a(8) =829a(9) =919a(10) =1021a(11) =1024a(12) =1174a(13) =1384a(14) =1643a(15) =1658a(16) =1669a(17) =1735a(18) =1838a(19) =1913a(20) =1921a(21) =2042a(22) =2048a(23) =2057a(24) =2311a(25) =2423a(26) =2768a(27) =3167a(28) =3286a(29) =3316