Numbers for which reduced residue system contains as many primes as nonprimes.

Terms

a(0) =3a(1) =4a(2) =5a(3) =6a(4) =7a(5) =9a(6) =10a(7) =15a(8) =21a(9) =45a(10) =58a(11) =82a(12) =86a(13) =92a(14) =105a(15) =116a(16) =196a(17) =238a(18) =308a(19) =310a(20) =320a(21) =380a(22) =972a(23) =978a(24) =996a(25) =1068a(26) =1368a(27) =5640a(28) =10890