Primes p such that (p-1)/2 and (p-3)/4 are also prime.

Terms

a(0) =11a(1) =23a(2) =47a(3) =167a(4) =359a(5) =719a(6) =1439a(7) =2039a(8) =2879a(9) =4079a(10) =4127a(11) =4919a(12) =5639a(13) =5807a(14) =5927a(15) =6047a(16) =7247a(17) =7559a(18) =7607a(19) =7727a(20) =9839a(21) =10799a(22) =11279a(23) =13799a(24) =13967a(25) =14159a(26) =15287a(27) =15647a(28) =20327a(29) =21599