Composite numbers k == 3, 7 (mod 10) such that 5^((k-1)/2) == -1 (mod k).

Terms

a(0) =7813a(1) =121463a(2) =195313a(3) =216457a(4) =315283a(5) =319507a(6) =353827a(7) =555397a(8) =559903a(9) =753667a(10) =939727a(11) =1164083a(12) =1653667a(13) =1663213a(14) =1703677a(15) =1809697a(16) =1958503a(17) =2255843a(18) =2339377a(19) =2423323a(20) =2942333a(21) =2987167a(22) =3313643a(23) =4265257a(24) =4635053a(25) =5376463a(26) =5979247a(27) =6611977a(28) =7784297a(29) =7859707