Odd composite numbers k such that 2^((k-1)/2) == -1 (mod k).

Terms

a(0) =3277a(1) =29341a(2) =49141a(3) =80581a(4) =88357a(5) =104653a(6) =196093a(7) =314821a(8) =458989a(9) =476971a(10) =489997a(11) =800605a(12) =838861a(13) =873181a(14) =877099a(15) =1004653a(16) =1251949a(17) =1302451a(18) =1325843a(19) =1373653a(20) =1397419a(21) =1441091a(22) =1507963a(23) =1509709a(24) =1530787a(25) =1678541a(26) =1811573a(27) =1907851a(28) =1987021a(29) =2004403