Primes of the form : 2*p+1=p1(prime), 2*p1+3=p2(prime), 2*p2+5=p3(prime).

Terms

a(0) =2a(1) =23a(2) =113a(3) =191a(4) =233a(5) =443a(6) =593a(7) =1031a(8) =1409a(9) =2129a(10) =2399a(11) =2543a(12) =4349a(13) =4481a(14) =4919a(15) =5231a(16) =5399a(17) =6263a(18) =6329a(19) =6449a(20) =7541a(21) =10253a(22) =10613a(23) =11321a(24) =12101a(25) =13463a(26) =13553a(27) =13763a(28) =14009a(29) =15773