Squarefree numbers (from A005117) with prime divisors in a 2p+1 progression.

Terms

a(0) =10a(1) =21a(2) =55a(3) =110a(4) =253a(5) =1081a(6) =1265a(7) =1711a(8) =2530a(9) =3403a(10) =5671a(11) =11891a(12) =13861a(13) =15931a(14) =25651a(15) =34453a(16) =59455a(17) =60031a(18) =64261a(19) =73153a(20) =108811a(21) =114481a(22) =118910a(23) =126253a(24) =158203a(25) =171991a(26) =258121a(27) =351541a(28) =371953a(29) =392941