Numbers k such that prime(2*k) - prime(k) == 0 (mod k).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =18a(5) =42a(6) =44a(7) =49a(8) =246a(9) =257a(10) =259a(11) =272a(12) =283a(13) =294a(14) =25284a(15) =62648a(16) =62664a(17) =62673a(18) =62700a(19) =62701a(20) =158706a(21) =404835a(22) =404859a(23) =405119a(24) =405448a(25) =405451a(26) =2630908a(27) =2630929a(28) =2631249a(29) =2631303